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Comments: There seems to be a divergent comment thread here if you scroll through the comments received
to date, and I will add mine as a possible way to clarify some of this divergent opinion. First off, the composition of 'zx' is
unique to Ashaway, thus many stringers out there at the club and tennis shop level may never have run across this string
before, and some of the poor reviews may source from non-optimally installed stringing (i.e., massive loss of tension post
stringing). Secondly, I'd wager that some reviews here are actually for the MonoGut (non-'zx' version) string. Poor
nomenclature choice perhaps on Ashaway's part, because both strings play vastly different due to their differing
compositions. Keep both these issues in mind when reading the past reviews. Also understand that this string is not a
poly, it's composed of a unique material, 'zx.' As far as potential users go, this string performs best for big, heavy ball
hitters using tour weight frames (i.e., strung weight above 11.5 ounces) with dense string patterns (i.e., 18x20). The string
displays amazing ball pocketing, due to its unique elongation properties, and slides and snaps back easily for ball bite for
folks using full western grips. However, if you don't hit big enough, and use a lighter frame, the string won't behave as
described. It's almost as if the 'zx' composition needs a sufficient force applied to it before it behaves as advertised.
Folks with low swing wgt frames, shorter swing paths and slower swing speeds likely are not stressing the string enough to
get the string to 'perform'. This may lead to the complaints about it feeling stiff (I don't even use dampeners in my Wilson
6.1 or Dunlop Muscleweave 200 frames using a full bed of 'zx') and powerless (as ball pocketing hasn't really kicked in).
For big, heavy ball hitters though, this string is the closest thing I have played with to the feel of natural gut, and adds
about as much dependable control as LUX tour level string offerings do, but with a much softer feel. Tension loss is
minimal, but predictable, so I typically install about 3 or 4 lbs above where I want the tension to settle in after an hour of
hitting. Once it settles in, play-ability is uniform over the next 12-14 hrs of hitting. As the string ages it losses a bit of its
snap back meaning you will have to adjust your strings a little as if you were using a multifilament. Ashaway also packages
this 'zx' string as a hybrid, and it performs excellent in that manner too, used as a cross with their unique braided kevlar (I
have that setup in my match play Six.Ones). You could also use it as the main and add a syngut of your choice as a cross
and the 'zx' won't significantly notch the cross if it's a 'coated' cross string. Lastly, for folks who complain about the
sound this string makes -- I'm not sure what to say about that, as it is a criteria that would never enter my mind as far as
choosing a string goes. Bear in mind that, since this is the only string on the market that is composed of this specific
material, it will be the only one that sounds the way it does. All in all, a tremendous playable and comfortable mono string
for big hitters looking for a option outside of the common LUX offerings. Because it is not common, using it might just give
you a performance advantage over the rest of the masses using big-name polys. Just make sure you (or your stringer of
choice) understands this is not a poly and thus has some stringing requirements/care that need to be followed.
From: Geoff, 1/16
Comments: I love this string. I have been stringing it in the mains at about 48 lbs with Ashaway Liberty in the
crosses, and the whole setup lasts for months and remains quite playable. No notching or dramatic loss of tension. When
you combine it with a cheap cross like Liberty the whole setup costs $10.
From: Nick, 12/15
Comments: Since I got the RF97A, I've been experimenting with softer mains with poly cross hybrids as a
viable alternative to sometimes harsh but spinny and long lasting full polys. Multifilaments and synthetic guts were a waste
of time and would get shredded within 1-2 hours. Natural gut mains work well, but expensive and not entirely uniform due
to the natural origins. Finally I tried the MonoGut ZX 16 (the natural color), I was surprised to find that this unique string
does in fact offer an alternative to natural gut. It slides easily on the poly and has great initial give (like natural gut) and
great ball bite and snap-back (like poly), so plenty of comfortable spin here with easy low speed pocketing which is great
for slices/volleys/touch play. Another interesting property -- this string does not get notched with a poly cross! Which
means it lasts and lasts and lasts without the usual deterioration of playability that polys suffer from. And since this string
is monofilament you can apply silicone lubricant to the stringbed for even more spin and durability. There is one thing
about this string that you may find to be a downside -- it vibrates at a higher frequency than even a poly, so you will hear a
very distinct ping on impacts without a damper. Doesn't bother me though.
From: Anton, 9/15
Comments: Ashaway Monogut ZX 16 is wonderful as a cross string. For four months, I have been using
Babolat Origin in the mains at 57 lbs with Monogut ZX in the crosses at 54 lbs in a Volkl V1 Midplus racquet. The feel is
crisp without shocking my arm. The ZX is very dent resistant, allowing the mains to move and snap back into place.
Durability has been very good and I haven't felt the performance change over time like with poly strings. The sound is
tinny if used without a vibration dampener.
From: David, 8/15
Comments: Not a fan. I had this strung 10% higher than my usual full poly set up and it just doesn't work for
me. I find it over powered and tinny feeling. Nothing like gut. I had a few other guys play with my racquet and compare it to
the same stick with Tour Bite. Everyone disliked the ZX feel and lack of spin.
From: Paul, 6/15 Comments: Works fantastically well as a cross string with poly mains -- much better than a synthetic gut or multifilament cross string. Crisp, yet comfortable, adds liveliness, power and spin to the stringbed. Terrific tension maintenance - - just make sure you follow Ashaway's stringing instructions.
From: Gavin, 11/13
Comments: I'm a big fan. I'm a 4.5 player and take a good cut at the ball. I am used to to using natural
crosses to soften up the string bed and provide comfort and feel. If you dial these up into the mid-upper 50s, you get just
- comfort and feel with good power like natural gut. I have been using a stiffer, lower powered poly like Volkl V-Torque, K-
Black Spiky Shark, or Genesis Spin X. All of them serve as great mains with this as the cross.
From: Anon, 7/13
Comments: I have played with both multis and monos and perfer the feel of multifiloment strings. In fact, I
natural gut in the mains with a nylon or syn. gut in the crosses. I am a serior sectional ranked level player and have a
playing style. I tried ZX (red) with X1 Biphase (red) in the crosses. This turned out to be a very good combo. The string
in regard to having sufficient power and provides excelent feel i.e. good spin and touch. I am somewhat amazed at the
of the string as a mono does not fray nor has really have I seen any notches. I do think to build a better feel and softer
one should string down about 12-15% on the mains and however you like the crosses.
From: Anon, 4/13
Comments: This string is not for a player that can not attack the ball in an aggressive manner. A quality
would serve a 4.0 player much better. Ashaway is a good company and has a solid line of strings, but this Zyex string
compare favorably to a Luxilon poly or any high end multi. Perhaps it does not cause any arm pain and it probably won't
for a month.
From: Mark, 2/13
Comments: Using this string for an elite junior recovering from elbow injury. Went to this after averaging 3
set of Babolat or Klip natural gut. This lasts 5 times as long and is nearly as soft as natural. Plays a lot like Wilson NXT and
BiPhase, but far more durable. If looking for a soft string, be sure you get the Zyex Monogut, rather than regular Monogut.
you are willing to insert string savers in natural gut, this has by far the best combination of durability and comfort.
From: G.T.M., 1/13
Comments: I think there must be some sort of formula switch with this string. I bought/used and liked this string I
bought about a year ago. I bought a new pack and it plays nothing like the so called same string as the one I just
racquet combination, same tension but plays and feels no where close to the older one. I cut out these strings I did as a
with gut. That was a mistake. Too stiff and plastic feeling. I was afraid I would get tennis elbow or should problems with
string after reading the review two below mine (from David). Sorry I have to give this a thumbs down vote. If this is a new
please bring out the old formula version.
From: Mike, 9/14
Comments: I played with this string in a two different racquets and the first one was a BLX Pro Staff 95 as
with XCel 17 and it was ok. Then I tried it in a Pro Staff 95S as a main and it felt horrible. It feels too plastic and stiff and
sensitive elbow didn't like the strings at all. I did cut it out the next day. I can't see where it feels like a gut -- it's not even
don't recommend buying this string.
From: Evan, 9/14
Comments: This is the worst string ever. It broke while tying the knot on the mains. What I had left over I
the crosses. I used Lux Alu for the mains. The ashaway monogut cut through the Lux Alu in 3 days and I hit mostly flat. I
about 10 lbs on from the Monogut and it gave the racquet s super dead feel or what others would say soft. Now because
was so much tighter than the Lux there was more vibration but not in a normal way. The extra stress from the dead
me arm problems. I have used other "Zyex" tennis strings before and this Ashaway monogut makes all Zyex strings look
From: Coach V, 4/14
Comments: I played with this string for a month, strung it twice at 55 lbs mains and 50 lbs crosses on a
string pattern with a 62 RA. It gave me good spin, but it felt kinda stiff. I thought it was stiff because of of advanced
I got the worst tennis elbow I ever got in my life. I'm writing this review after having tennis elbow for over 9 weeks. Do not
string if you think it's going to be good on the elbow. I played with rough polys like LUX rough, snake bite, and others
58 lbs and it did not give me this type of issue. If you are going to buy this string, string it at high 40s lbs or lower. Be
this string. I am a 4.5 player,and I play about 4 times per week.
From: David, 4/14
Comments: This string is revolutionary. You should try to pre-stretch it before you use it. It is simply
From: Fred, 4/14
Comments: I bought two sets of strings based on their amazing physical metrics. On paper, in terms of
properties (stiffness, etc.) they seemed to be the closest thing to gut. However, in the real world, they felt horrible. The
told me those were some of the stiffest strings he had ever strung. After playing for 30 minutes, I decided to cut my losses
and cut them and return to my standard Technifibre X-Biphase 16 gauge. If you like any of such "soft" playing strings that
gut like, you will most probably hate this ZX strings. It plays completely differently. It feels stiffer. It has a disturbing high
metallic sound. When I played during the same practice session with my Technifibre X-Biphase, the contrast was brutal.
was no doubt, I had to replace the ZX with the X-Biphase immediately. I am really puzzled on how a string can look so
objective physical metrics (low stiffness like gut). But, actually feel, play, and sound just the opposite is beyond me. My
that the physical metrics capture one thing. And, they miss out a lot. In other words, don't just buy strings based on
metrics as I have. The latter provides you either flawed or incomplete information.
From: Guy, 11/13
Comments: Too much vibration with these strings. Need to be used with higher tensions (close to 60 lbs),
aren't designed to be strung at the high tensions (difficult to string it at 58 lbs and higher). Durable, holds tension well,
balance for all types of strokes. It isn't very efficient in terms of developing of spin. I cannot recommend these.
From: Bedrock, 10/13
Comments: Fantastic string! This is the second feedback after April, 2013. Now I hybrid ZX on the
soft co-poly on the main. My favorites are 17ga YTex Pro-Tour and 17g Topspin Cyber Blue. These hybrids are phenomenal
their performance characteristics such as feel, comfort, power, control, durability, etc. Tension retention seems to be quite
when properly handled. ZX is a highly elastic string. It stretches while being pulled, you are gonna have to pull three times
more making sure stretching has stopped. Therefore, stringing will be more time consuming than other type, but it's
Now I have four of my customers on MonoGut ZX.
From: Mike, 7/13
Comments: This string plays amazing as a cross string. I was playing with some unknown super soft
it killed all the feel and touch from my K90 racquets, something I thought no string could do, so I cut that out in three days.
I tried this string and it feels better than LaserFibre string (if anyone remembers the brand), it seems that the string is best
hybrid and not a full bed, tension maintenace so far seems great, but I've only hit three hours with it.
From: John, 6/13
Comments: I strung this at 55/53 lbs in a modified Pure Storm GT using an electronic CP machine
Ashaway's detailed instructions to avoid breakage during installation. It's a very comfortable string with a feel similar to a
co-poly or stiff multi. However, it's also very powerful and offers very little control or feel. After a month of testing I came to
conclusion that other strings offer far more control and more spin with the same power for the same or lower price. The
simply too erratic in performance compared to strings in the same price range.
From: Tim, 6/13
Comments: Fantastic string. It has it all. Power, ball pocketing, arm friendliness, durability, to name a few.
it's wrong to compare this with a poly. The elongation is like a soft multi, yet the durability is close to a poly. I first tried
ZX full bed on my Microgel Radical OS and it feels weird. Then I used it on the mains with Isospeed Control Classic 16 on
crosses. Now it's a million dollar hybrid. There is one caveat though! You have to double or triple pull since the string keeps
relaxing during stringing. Ashaway acknowledges it. I would recommend every serious tennis player should try it out. I am a
4.0 doubles player and a USRSA certified stringer.
From: Mike, 4/13
Comments: I like this string. It is soft on the arm, powerful, good spin, does not need straightening, and
tension. Plays a bit like a poly but also very soft and powerful.
From: Downunder, 3/13
Comments: Be sure you are commenting on the Zyex Monogut, rather than the Monogut. There is a big
The Zyex Monogut is softer and has better feel. It's a great string, though more expensive than the Monogut. Zyex
nearly the durability of polys and impressive feel. I string it at 54 lbs and it plays very similar to natural gut. The only strings
play as well and are not natural gut are Wilson NXT and Tecnifibre Biphase. The Zyex Mongut lasts 3 times as long as
From: G.T.M., 12/12
Comments: I like this string a lot but why do the crosses move in both directions (up and down). The
move. I've been stringing for 30 years while never experiencing this phenomenon with any other string. I can't find an
anywhere on the internet.
From: David, 7/12
Comments: To me, this string played like any soft poly. Very, very similar to a Polyfibre or MSV string. I
injury and I need a soft string bed, I was hoping for a nice control string that didn't make my wrist hurt. Ashaway Monogut
To mention the word "gut" in the description of this string, should be criminal.
From: Bud, 3/12
Comments: I thought I would try a new string and unfortunately I wasted my money on this string. I purchased a
frame and choose this string to be strung at 58 pounds, but after playing with it for two hours, it felt like it had lost all its
had our stringer test the tension and it was registering at 34 pounds in center of the sweet spot and 40 on the outer edges
string bed. I had the frame restrung using Ashaway's 17 gauge Kevlar for the mains and used the Ashaway MonoGut ZX 16
the crosses at 58 pounds for both strings. After two hours of doubles play, the tension then registered at 50 pounds. If you
heavy hitter, I would not recommend this string.
From: J.P., 10/14