Hotrose US 3 PCS Set Hand Gripper Grip Silicone Ring Resistance Strength Trainer Exerciser Three pieces set,which includes 30lb, 40lb and 50lb hand grippers. Material--The grippers are made from premium silicone, the high quality item can strenghten 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. Fit for men and women.