Non-Toxic Material: The product is made by extra-tough rubber, good elasticity, bite-resistant and nontoxic, non-abrasive, safe for your sweet dog grinding and cleaning their teeth. Entertaining: Perfect for fetch and interaction with your dog. You can add food or treats into the grooves and this can keep them busy for hours. Strong Teeth: Soft and unique surface relief, can effectively help clean their teeth and keep their gums healthy. Intelligence Improvement & IQ Training: The ball is a great toy to train your dog and increase your mutual interaction. Its grooves further help attract your dog's attention by adding treats or food into the grooves. Wide Selection: The ball comes in 2 different sizes and 4 different colors.