[ Construction]: Our hand grip strengthener is made of Aluminum material and designed with ergonomic aluminium handles.Strong compressing spring and the reasonable gripper construction make the whole product more firm. [Metal Grip Strength Trainer]: Great for enhancing hand strength & rehabilitation. Improve and enhance strength, endurance, dexterity, muscular tone, fine and gross motor skills of your hands, fingers, wrist and forearms, perfect for people who have Arthritis, Tendonitis, Carpal Tunnel. And also suitable for musicians, athletes, golfers, rock climbers and tennis players. [Grip Strength Trainer Set]: Pack of 3 , 100lbs, 200lbs and 3000lbs. 3 different weights 3 training levels,The 100 lb is doable. The 200 lb is challenging; while the 300 lb is insanely difficult. Got these to strengthen your grip now. [ And Portable]: Easy to fit in your pocket or backpack, you can take hand gripper with you wherever you go.You can do workout anytime you want with these hand Grip Strengthener. [Perfect Item for Daily Strength Training]: Forearm strength Trainer is great for climbers, weightlifters, athletes or all men and women, seniors, kids looking to improve hand strength. You can enjoy exercising during work or leisure. Exercise your hand anywhere and anytime. color:Silver Material:aluminum Package Contents: 6 x hand grips Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.