Send your spike to the right spot with the Wilson K1 Silver Indoor Volleyball. This composite leather ball is engineered with power lining technology which transforms the balls kinetic energy for the perfect balance of power and control. Details Command lining offers more power and velocity through the transfer of kinetic energy Leather cover and lining combination enables control to improve directional changes all over the court Composite leather covers offers durability and consistent performance Softer feel for younger players Indoor use NFHS approved