Wrist strength balls will not become loose for no reason. Bend, vibration, or unusual noise caused by dropping the ball will directly affect its use and cannot be repaired. New users should carefully check that the wrist strap is secure and fastened before use. The wrist strap is for drop protection only. Do not swing the wrist strength ball in vain or apply pressure to the center of the ball, as this may damage the shaft and cause it to become unusable or increase the noise level. When using the wrist strength ball, use your wrist in a circular motion. Do not use any exposed part of your body to try to stop a high-speed wrist strength ball to avoid injury. Do not add anything to the wrist strength ball, as this may directly cause the product to malfunction. Wrist strength balls are not recommended for those under 10 years old or over 80 years old.

What's in the box
1 X Wrist Strength Ball