The V OSTRA V2 uses RED-CELL, the most advanced carbon-fiber material in the racquet sports industry in multiple locations to make a more durable frame with better feel and improved dampening. It also features Super Grommets and Volkl 's exclusive Catapult system to give the V OSTRA V2 amazingly controlled power with great spin potential. Volkl Vostra V2 Tennis Racquet - Unstrung | 4.25 | Christy Sports