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Description: Dual tennis, two tennis balls in one tennis training machine, When used,one side of brand tie with white line on the ball, another side can tie in the racquet, sand or small stone can be put in to the training machine.
Material: chemical fiber, Thailand natural rubber bladder。  
Rebound height: 130-140cm (Free falling 2.54m height)
Forward deformation:0.22-0.26IN
Rebound deformation:0.315-0.36IN
Executive standard: QB-T2770-2006
Suitable for: Beginner