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 signiture Gizmo toy from Gor Pets has an encased squeaker which means even if the toy is pierced it still continues to squeak. It also has a groove around the toy to insert small treats. Gizmo squeaks and has treats, making this the ultimate dog toy. The Flex material ensures long lasting funtime for your dog.