Wilson Four BLX Racquet Technologies
Hammer technology maintains the majority of racquet mass, or weight, in the head of the frame (head heavy balance), with the intention of increasing stability and power. In turn, weight is reduced in the shaft and handle, providing for a higher and larger sweetspot, or Center of Percussion (COP).
BL=Basalt. Basalt is a natural volcanic rock. It can be used in manufacturing where it is made into fine gold fibers with incredible vibration resistance. These new fibers are woven longitudinally with [K}arophite Black to create one of the most advanced composites in the industry.
Wilson Four BLX Racquet - Where to go from here