The Wilson(R) OPTX AVP(R) Tour Outdoor Volleyball is designed to allow athletes to track the ball and detect spin during a game. This outdoor volleyball is engineered with Optic Flow graphics which improve ball tracking in a variety of environments. The Superior Spin Detection VST(TM) uses strategically placed color variance which allows athletes to read and react to spin. Details Optic Flow graphics allow for enhanced ball tracking VST(TM) uses color variance for superior spin detection Signature AVP(R) game ball construction with improved visual design Approved AVP(R) ball Outdoor use