SMA Bóng tập cơ cổ tay thiết kế xoay tròn chuyên nghiệp tiện dụng

Estimated delivery time for this product is 7-9 days Bright black (auto start without light / metal core) 1 # Brilliant blue (self-starting without light / metal core) 2 # Red Chinese style (no light / Metal Core) 3 # Glory Black (colorful / metallic glossy core) 4 # Blue (Metallic / multicolored glossy core) with 5 # wire Glory Red (Metallic / Colorful Ball Core) 6 # Black [Bright colorful metallic ball core] 7 # Brilliant blue [Metallic shade / vibrant color] 8 # Chinese style red (Multicolor / Metallic glossy core) 9 # Pure black [Without glossy / metallic core] 10 # Wrist training exercises Develops multiple gravity to solve choice problems Pure mechanical design, core rotational rhythm and speed possible can be adjusted freely through human control, The faster the speed, the greater the power. Other groups of people Different intensity can be controlled differently, Third generation wrist training ball based on fact to develop wrist-based booster balls suitable for groups of people different to exercise.