Our Grriggles FUNdamental Dog Toys are made of TPR (thermoplastic rubber) for an intriguing and interactive toy that dogs will never want to part with. These FUNdamental Footballs: Have an irregular football shape-making them bounce unpredictably. Are made with two distinctive textures for endless chewing fun. Floats in water. Promote fitness and dental health. Coordinating FUNdamental toys are available and are sold separately, items US2152, US2153, US2156, US2155, US2154.