Description: 【Silicone Material】The hand exercise ring is made from premium silicone, elastic and stretchable, nonslip construction, tear and crack resistant 【Size Information】The silicone grip ring measures in diameter 78.5mm/3inch, in thickness 25mm/1inch, portable and easy to fit in bag or pocket 【Function】Hand Grip Strengthener Ring can build strength in the fingers, hands, wrist and forearms varied activities, including crushing, pinching and extension work 【Feature】This lightweight grip trainer comfortably fit adult hands, which makes you feel comfortable when do hand exercise 【Application】Double Force Grip Ring with grip strength training great for men, women, seniors and teens, great for athletes(tennis, basketball, boxing, golf, etc.) and musicians (guitar players, pianists and violinists) Package Includes: 1 Hand Grip Strengthener Ring(6 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.