Product Category: Double Competition & Practice Ball Diameter: 1.685 inches Weight: 0.1 lb (single ball weight) Number of hits: more than 1000 times Outer layer: External material: Polyurethane Size: 1.685 inches Hardness: 92c (shore c) Compression: 75-90 Bounce coefficient: 0.785-0.795 (@ 125ft \ s) Thickness: 0.043 in Bee-dong Type: 352,332,392 Inner layer Internal material: butadiene rubber Size: 1.58 inches Hardness: 85c (shore c) Compression: 60-70 Bounce coefficient: 0.785-0.795 (@ 125ft \ s) Quality assurance: USGA certification, the United States R & A certification, rest assured to buy, have any questions at any time to contact us
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