Tired of toys that can't take the heat? Then treat your pup to long-lasting fun with Outward Hound Fire Biterz. Invincibles Fire Biterz are made from durable fire hose material for long-lasting fun. These dog toys are a playful combination of our traditional fire hose and new ballistic material. Featuring a tough outer layer of durable fire hose combined with Invincibles squeakers that keep squeaking if punctured and new Chew Shield Technology, Invincibles Fire Biterz are made so dogs can play longer and harder.