3-in-1 - Iron Crush Silicone Ring hand grippers are suited for all three major grip training types. These rings can be used for Crushing,pinching and even extension,with equally amazing results (Please keep in mind,you cannot actually extend these rings,you just perform an isometric movement while pushing your fingers,which is really effective). They are also an awesome option for stress release providing you with energy and leaving you feeling fresh. SET OF 3 LEVEL RESISTANCE - Three piece set includes 30lb,40lb and 50lb hand grips,allowing you to gradually increase the difficulty of your training as your strength improves or to benefit from interval training,alternating between the three grips in a single workout. The grippers are color coated according to the martial art belt colors for quick identification. To see our 3 other levels of resistance please type B00XIHGBGY into the search bar. SUITS MOST SPORTS - These grippers are great for training athletes,and giving their performance a positive boost. Sports such as Tennis,Basketball,Baseball,Golf,MMA,Wrestling,Boxing,crossfit and especially rock climbing can benefit from better grip strength. SIZE FOR PERFECT,COMFORTABLE FIT - Sized especially for adult hands,unlike other brands,to maximize the benefits of the exercise and ensure a challenging,yet safe experience. Great for men or strong women. YEAR 100% MONEY BACK WARRANTY - The grippers are made from premium silicone. The exceptionally high quality also comes with a 2 year warranty. If the product rip,tear or break due to use,you can get a full refund or have them replaced 100% guaranteed.