Hyper Pet Tennis Balls - Green - 12 Pack - Hyper Pet Tennis Balls are not your everyday tennis ball as Hyper Pet has designed them to be safe for dog's teeth. 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 playtime with your loved one. They also float so they won't get lost in the water. Each pack contains 12 balls that are 2.5in diameter. Ideal for dogs 25lbs and over.