Professional Training Tennis Balls Elasticity Practice Ball 25 Group Description Made of polyester fiber and rubber, our tennis balls offer excellent wear-resistance, pilling-resistance and playability. More thicker interlocked wool fiber for longer wear, more durable Thickened tennis liner for better sealing and long-lasting airtightness Standard pressure training tennisthe Feeling is comfortable, the landing point is easy to control, the speed is slow in order to train beginners PRACTICAL and DURABLE: made from non woven polyester felt fabric and Eco-friendly rubber. These practice tennis balls are waterproof, moisture-proof and wear-resistant to meet the needs of various venues. SOFT RUBBER: low inflation, slower ball speed, comfortable feeling and easy to be controlled, suitable for beginners, woman and children. LIGHTWEIGHT: Weight: 56.7g, Diameter: 63.5mm, Bounce Height: 130cm , easy to carry and control. APPLICATIONS: Ideal for tennis ball machines, tennis practice, or even playing with your pets.