Nylon winding under tough rubber cover keeps these balls bouncing on and on. Compared to standard balls, these 3-ply balls are firmer, more durable, and more difficult to overinflate. Deeply etched surface makes them easy to handle. Offered in an all-purpose 8 1/2''-dia. size in 6 popular colors. And remember, they carry a 2-YEAR WARRANTY! Red, Yellow, Green, Blue, Orange, Purple. Six balls--one of each color. Plus, you get a FREE 24" x 36" mesh storage bag!