About this item Must Have For Beginner : The Set Is a Great Beginner Set To Improve Your Overall Grip Strength, Recover From Injury Or Increase Your Finger Strength Material :Made Of a Eco-Friendly Plastic That Feels Comfortable When You Do Your Hand Exercise.Plastic Hand Resistance Finger Extensor Exerciser Strengthener Trainer,Visible Physical Force Adjustment, You Can See The Change While Practice. Protable and Lightewight :Exercise Your Hands And Forearm From Anywhere Whether You Are At Home, In The Office, Walking, In The Car Or Doing Your Favorite Sport As The Rings Are Lightweight Easily Portable. Comfortable To Use :Designed To Fit Your Hand Perfectly So That You Can Easily Do a Full Exercise Without Adjusting The Grip Strengthener Or Finger Stretcher. Feel Free To Adjust The Size Of The According To Everyone's Finger Condition Applications: It Can Improve Finger Strength For Athletes (Rock Climbing Enthusiasts, Fitness, Tennis, Baseball, Boxing, Tennis, Golf And Shooting) And Musicians (Guitar Players, Bass Players, Pianists And Violinists). Colour: Black Size: index finger inner diameter 2.3cm, circumference 7.2cm, middle finger inner diameter 2.3cm, circumference 7.2cm, ring finger inner diameter 2.2cm, circumference 7.2cm, little finger inner diameter 2.1cm, circumference 6.59cm Total length 20cm Package Quantity: 1Products from GuanGuan's store