MATERIAL - Made of 100% natural rubber, no chemical smell, Non-toxic,healthy and eco-friendly, safe and sturdy ,supper flexibility, strengthen the tolerance of being bitten BALLS PERFACT SIZE - 2.8 inch/7cm 2 Pack dog Solid Rubber Bouncy Balls, standard size for dog puppy chewing/playing BOUNCY - The textured design makes this ball easy for dogs to grip, even when wet! The Balls are bouncy and encourage jumping, catching and chasing during play SOLID BALLS - not hollow.high durable,high tough and durable. EASY TO CLEAR - simply wipe with cloth or rinse with water.