KONG Tires is a durable tire chew designed to provide the ultimate chewing experience. The uniquely shaped sidewalls and thick outer tread create a super durable, elastic barrier. The sidewalls are designed to double up and rebound when compressed to provide an active chewing experience, and the Tires are perfect for bouncy games of fetch. Tire shaped toy made of durable KONG Extreme Rubber for determined chewers Fill inside wall with Snacks™ or Easy Treat™ to extend playtime Made in the USA. Globally Sourced Materials. IMPORTANT: Supervised use only. Remove all packaging. Discontinue use if damaged. Size Recommendation: Small: Up to 35 lb / 16 kg Medium/Large: 30-60 lb / 13-30 kg