Designed for indoor and outdoor use, the Champion Sports Rubber Volleyball is constructed with a rubber cover, which ensures the ball will withstand regular use on playgrounds or sports fields. With a nylon-wound butyl bladder, this volleyball boasts superior air retention, keeping it inflated after consistent use on hard volleyball courts. Diameter: 11"; Material(s): Nylon-Wound Butyl Bladder; Rubber Cover; Regulation Size: Official Size; Color(s): White.