The Head Graphene 360 Speed Pro tennis racquet is perfect for passionate, advanced level players who want optimized control of the court. The built-in, Graphene 360 technology makes this racquet truly unique. With its benefits, players can hit with a greater stability and enhanced energy transfer for more power and ball speed. This frame features an 18 x 20 string pattern, which is different from the other frames in the Speed line. Features excellent handling and power in a lightweight frame. Includes new Graphene 360 technology for more stability. Speed Series endorsed by Novak Djokovic .