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DD4:
Description: Advanced training tennis ball
Material: Taiwan acrylic wool, 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
Weight:54.7-57.5g
Diameter:63.5-66.7mm
Executive standard: QB-T2770-2006
Suitable for: Professional athlete