1Cashmere and Rubber: The outer layer of the tennis ball is made of cashmere, and the inner liner is made of natural rubber. The size, bounce and deformation are strictly controlled. 2Soft and Elastic: These lightweight ball, with soft touch, 50 percents decompression compared with adult tennis, are kept soft and elastic. 3Waterproof Outer Layer: With the waterproof outer layer combined with thickened plush, this tennis balls are suitable for different moisture and cement fields, suitable for children's training or youth training. 4Multiple Purposes: This tennis balls have multiple purposes that are applicable to training competitions, campus exercises, yoga fitness, massage and pressure relief. 5Various Venues Applicable: Our tennis practice balls are suitable for a variety of venues, such as grass, plastic floor, wood floor, sand ground that you can freely training your tennis skills.