The Chuckit Whistler ball twitters and whistles during flight for added fun with your dogs playtime! With high bounce and very durable you will never go back to any other ball once you throw this!Easy to clean natural rubber and each pack contains 2 balls, 1 blue, 1 orange.Key Benefits Offers high bounce, buoyancy, visibility, and durability Featuring an extra-thick natural rubber core The orange and blue design means pets and pet parents can easily spot the bright ball during outdoor play Easily wash off dirt or slobberProper supervision is advised when playing with all toys to ensure no accidental swallowing. This toy should be regularly inspected to ensure there is no damage. If any damage is seen the toy should then be discarded.