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TZ4:
Description: Competition champion tennis ball
Material:60%imported wool, Thailand natural rubber bladder
Rebound height: 140-147cm(Free falling 2.54m height)
Forward deformation:0.220-0.291IN
Rebound deformation:0.315-0.415IN
Weight:56-59.4g
Diameter:66.0-68.0mm
Executive standard: QB-T2770-2006