The Chuckit Whistler ball twitters and whistles during flight for added fun with your dog's 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. Please Note** Do not leave unsupervised with your pet. Proper 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.