... 4" 1. material: made of high quality thermo plastic rubber, pass EN71 and ASTMF963-03, toys for dogs, durable ... satisfy dogs with typical chewing temperaments, ultra strong rubber compound with exclusively formulation is suitable for tenacious chewing ... of rubber toys for dogs, such as rubber ball with rope or without rope, rubber bone, rubber stick, rubber pipe, rubber flying saucer, rubber wrench, ...