The Wilson® OPTX AVP® 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™ uses strategically placed color variance which allows athletes to read and react to spin. Details Optic Flow graphics allow for enhanced ball tracking VST™ uses color variance for superior spin detection Signature AVP® game ball construction with improved visual design Approved AVP® ball Outdoor use