[K]arophite Black is a proprietary next generation structure created through a unique process at the nanoscopic level resulting in more feel and a stronger and more stable racquet.
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.