The Gor Flex range is made using TPR (thermoplastic rubber) which offers a superb combination of rubber and plastic to give a very tough and flexible toy. The Squeaky Ball is larger than the Bouncy Ball and has an encased squeaker which means even if the toy is pierced it still continues to squeak. It is super bouncy and has nodules for an easy grip. The Flex material ensures long lasting funtime for your dog.