●Material: HPWFHPLF Tennis Balls are made of chemical fiber and natural rubber, which is safe for dogs. ●Regular Size: The Diameter is about 2.6 Inches. HPWFHPLF Colorful Tennis Balls are just built the same as regular tennis balls. ●Bounce Height: Our tennis balls with many colors available can bounce to 135-165 CM high, which is great for beginner and tennis practice or dog toys. ●Multi-uses: You can use them for tennis practice, walker and chairs or playing with your dogs. Decoration is okay too. ●Package : 4 packs HPWFHPLF tennis balls