Super-bouncy and irresistible, Kong's exclusive super-bouncy red natural rubber compound is irresistible for most dogs. Chewer-friendly sizes are available to satisfy dogs with typical chewing temperaments. The Chase Is On... When a Kong Toy hits the ground, dogs instinctively "GO FOR IT!" The Jawrobics Workout... The chase promotes a healthy, stimulating "nose-to-tail" workout of every muscle and reflex. After The Catch... The all-rewarding chew begins; and goes on and on and on. Kong's strong, thick, flexible walls keep springing back for more. It satisfies a dogs natural need to chew and also cleans teeth and conditions gums. Self-Entertainer... Every time your dog drops a Kong Toy - it's a new game! "World's Best Dog Toys" Kong Toys provide unmatched performance and benefits. They are used and recommended by veterinarians, dog experts and satisfied customers worldwide. Puncture Resistant Super Bouncy Natural Rubber... Kong's exclusive Ultra-FlexÅ formulas are chewer friendly. They are unmatched for resilience, durability and bounce. Ultra-FlexÅ rubber is nontoxic, nonabrasive, non-splintering and does not get sharp when chewed.