Made To Endure And Satisfy Those Dogs That Can Spend Enough Time Chewing, The Kong Duramax Dumbbell Features The Ultra-Durable Kong-Crafted K-100 Material That Gives Just Enough Flex To Make It Irresistibly Satisfying While Standing Up To Long-Lasting Chew Sessions. Dogs Delight In The Feel Of The Textured Surface And Ridges That Have The Added Benefit Of Helping Clean Teeth. A Squeaker Adds To The Fun And Keeps Dogs Engaged For Long-Lasting Chew And Play Sessions.