For dogs up to 30 lbs. Chew Level: Strong. 2 ply flossing nylon. Real tire tough. Natural rubber. Cleans teeth & gums. Interactive toy. Dogs need to play. Dogs love TireBiters. The TireBiter Pawtracks are interactive toys that satisfy playing requirements and are training aids for dogs. It is a fun, safe, real-tire-tough and natural rubber toy. The two-ply nylon formula flosses while dogs chew. Made in China.