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Black Diamond Self-starting 1# [Platinum-Cool Black] Self-starting/no light 2# 【Platinum-Burning Red】Since start/no light 3# 【Platinum-Dazzling Blue】Since start/no light 4# Black King Kong self-starting model + ball bag 5# [Platinum-Cool Black] Self-starting / without light + ball bag 6# [Platinum Model-Burning Red] Self-starting / without light + ball bag 7# [Platinum-Dazzling Blue] Self-starting/no light+ball bag 8# Targeted wrist exercises Develop multiple gravity to solve selection difficulties Pure mechanical design, the rhythm and speed of the core rotation can be adjusted arbitrarily through human control, The faster the speed, the greater the power. Different groups of people can control the intensity differently, The third-generation wrist force ball is based on experimental data to develop a wrist force ball suitable for different groups of people to exercise.