【Ideal Specification】 Diameter: 2.5 Inches; Bounce Height About 54in. They better bounce than pressureless balls. These practice tennis balls are almost the same as the standard ones, with excellent bounce height, and can be used as professional training balls. 【Package List】40 tennis balls, and comes with a reusable mesh bag with sliding drawstring cord lock closure. Take it and retrieve the balls conveniently. 【Durable Material】 This tennis ball is made from natural rubber and durable well-bonded felt material for a consistent feel and reduced shock. Thickened materials, more durable, long service life. 【Multi-purpose & All Courts】 Our tennis balls can be training balls, game balls, dog game balls, walker floor protection balls, chair leg noise reduction balls and more. It can also be used for home entertainment and gifts. Can be used on any court, hard or soft, clay or cement, indoor or outdoor. 【Ideal Sports 】 40 PCS for coaches, students, and pros alike. They're perfect for lessons and are also tennis-ball-machine compatible for solo serving sessions. It can also make dogs busy and happy. Have a good time with your pet. What you get: 40 tennis balls, comes with a reusable net bag. Pick it up and get the balls easily. This tennis ball is made of natural rubber and durable bonded felt material for a stable feel and shock absorption. Thicker material for more durability and long life. Our tennis balls can be used as training balls, game balls, dog game balls, walker floor protection balls, chair leg noise reduction balls, and more. It can also be used for home entertainment and gifts. It can be used on any court, hard or soft, clay or concrete, indoor or outdoor.