Wilson Power Grip Basketball Size 7 29.5" Official Size - Orange Grey Wherever. Whenever. Indoors or outdoors. You're always ready. You need a ball that can match. The Power Grip offers superior durability and traction for elite feel and performance. Plus, it's rubber cover works on all surfaces, so it's always game time. Size 7 / 29.5" (Official Size) All Surface Cover - Optimal Rubber for All Courts Treaded Traction - Maximum Control, Durability and Grip Nine-Panel Construction - Creates Additional Ridging for Superior Ball Control