SCIENTIFICALLY ENGINEERED: Scientific Design & Attractive Color, Fits naturally into the Palm for ease of use

Instruction -- Massage your muscles gently with the tool. Just lay it flat on the muscles, without high angle, make the whole close to skin when you roll it.

PERFECT MASSAGER FOR FULL-BODY EXERCISE: To warm up before sports such as climbing, football, tennis, basketball, golf, relax the body, strengthen muscle strength such as hands, shoulders, back, legs and feet; it can also be used to relieve muscle soreness after exercise. Meet your daily exercise needs.