Comments: We like these balls very much. We bought them to use in instructing our children (ages 9-13). They have just the right amount of liveliness; it does feel like they are about 30% less
bouncy than regular balls. We have tried out three other ball types. The Penn qst 36 was way too soft and sluggish for us; the Penn qst 60 was better, but still too dead for us; the Tretorn Micro X was a little like hitting a brick and with too much bounce. We liked the feel of the Penn Control immediately. They are great for the children learning to hit and even for my wife and I rallying.