Impact absorbing and moisture resistant. The casing is sewn from 18 oz. flexible vinyl coated polyester. The casing design and construction insures that the implement remains dimensionally stable and balanced. The trade secret and craftsmanship utilize the casing to retain the various fibrous cores under tension so that each ball regardless of weight has a friendly feel and will absorb high velocity impact. Wall Balls Not Designed For Slamming
*Please note our Wall Balls are tough but they're not slam balls.Slamming any Wall Ball will void the warranty. We offer a 30 day warranty on this item (with proper use) Warranty covers stitching only.