What's more fun than an old tennis ball? A baseball! And a basketball, a football and... a billiard ball! All of these come in the form of KONG® Sport Balls, made of rubber suitable for dog toys and in the right size for your dog. KONG® Sport Balls are a set of balls made of thick, sturdy rubber. They bounce extra strong and far, making them perfect for challenging fetch games. The bouncy balls promote your dog's play instinct and thus his mental health. Playing together also strengthens the bond between you and your four-legged friend. But above all, playing fetch with KONG® Sport Balls is incredibly fun. The KONG® Sport Balls are much gentler on the teeth than real tennis balls. The cover of the KONG® balls is specially formulated so that it does not rub against your dog's teeth and also does not hurt the gums. Note: Please never leave the pet unattended while playing. No toy is indestructible. To prevent injuries, the toy should be checked regularly for damage or loose parts and replaced if necessary.