The thick, natural rubber of these Kong Dental Toys provides dogs with a real chewing workout. Revolutionary design makes toy bounce unpredictably in every direction. Stuff with peanut butter or treats for even more fun. Non-splintering, non-abrasive, and does not get sharp when chewed. Available in the sizes listed below. Small 3 In, Medium 3.5 In, Large 4.5 In, X-Large 5 In, King Kong 6 In.