Tosnail 3 Pieces Hand Gripper Grip Silicone Ring Resistance Strength Trainer Exerciser & Hand Exerciser - Black, Green, Red Three pieces set,which includes 30lb (green), 40lb (black) and 50lb (red) hand grippers. Material--The grippers are made from premium silicone, the high quality item can strenghen your muscle. Sized especially for adult hands, to maximize the benefits of the exercise and ensure a challenging, yet safe experience. These rings are great for training athletes, and giving their performance a positive boost. 3 Colors - Black, Green, Red. Fit for men and women.