The Virtually Indestructible Ball™ is just that, virtually indestructible! For use as a push and play toy, this ball will last and last. Made from a hard, high density polyethylene, the material is safe, washable and durable. Size this ball appropriately for your dog. The size should be difficult for him to get in his mouth. While not designed to be a chew toy, this ball will exercise your pet like no other! Since 1992! The Original Virtually Indestructible Ball™ for over 20 years!