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. Made of thick, puncture-resistant rubber; dome shape is hollow in the center. Red. Made in the U.S.A. Small 3" Medium 3.5" Large 4.5" X-Large 5" King Kong 6"