The SPOT by Ethical Products Play Strong Bones Chew Toys and Ball Toys for Dogs – Great for Aggressive Chewers and Puppies – Ball – Small is a brilliantly designed toy that is perfect for large and giant aggressive dogs. Made from a thermoplastic rubber (TPR) material, these toys are designed to be durable and resistant to wear and tear. With a hollow center, this toy provides plenty of room for treats or other accessories.