The Volkl V8 Pro Unstrung Tennis Racquet has improved super grommets and V-Cell technology that is a lightweight graphite that will improve responsiveness and feel. This racquet also features Reva technology that helps eliminate racquet vibration for a smooth feeling frame. There is a silicone polymer in the butt known as Vtex and this racquet is great for aggressive baseline players that want a spin friendly frame with an awesome mixture of power and control.Racquet Comes UnstrungHead Size: 100 sq inWeight Unstrung/Strung: 305g/320gLength: 27inString Pattern: 18x20desired String Tension: 50-60 lbsStiffness/Flex: 67Beam Width: 22/24/22mmBalance: 1.1in HLSwing Weight: 316Power Level: LowSwing Speed: FastSwing Type: FullIntermediate-Advanced Level RacquetGraphite CompositionSuper Grommets TechnologyREVA, V-Cell Frame TechnologyVTEX Butt Cap, V-Sensor HandleVSENSE GripModel Number: V12880