Wilson Surge BLX Tennis Racquet Unstrung tennis racquet Basalt: A natural volcanic rock, made into fine gold fibers with incredible vibration resistance; woven longitudinally with [K]arophite Black to create an advanced composite; delivers clean feedback and better sensation Double Hole: Bigger holes allowing 26 string movement for a bigger sweet spot Performance Hybrid Grip: Cotton base for a balance of comfort and sensation Power: Medium