Feature:Rubber grip ring O-type finger strength training rehabilitation grip device The colors of the massage grip ring are yellow, red, green, blue and orange，Send in random colors Helps blood circulation in the arm area.Prevent the occurrence of joint diseases such as rheumatoid arthritis of the arm Can make the arm muscles stronger and relieve fatigue It is not recommended to do it after 8 o'clock in the evening, as it causes disorders of the autonomic nervous stem and affects the regularity of the body's biological clock Action points: if you dont understand your arms, tighten your shoulders, use your three fingers, hold to the limit and pause for 3 seconds, then relax and then squeeze Rehabilitation people and the elderly can shorten the time of squeezing according to the situation Random Color Delivery Quantity: 1 Piece