Hyper Pet Pet Tennis Balls for Dogs, Pet Safe Dog Toys for Exercise and Training, Pack of 2, Green A perfect compliment to the K-9 Cannon or on their own! They're made of grade A rubber, non toxic and don't contain harmful coatings or gasses, so you can feel confident about having play time with your loved one They also float so they won't get lost in the water Each pack contains 2 balls that are 2.5&quot; in diameter Ideal for dogs 25 Lbs. and over