Main function: our finger strengtheners are designed to develop and maintain the strength and dexterity of your fingers, hands, and forearms, available in 4 different levels of tension, which is convenient for you to change a new device when you progress, convenient and practical^ Optional tension levels: the tension for this hand grip strengthener starts from 1.2 - 5 kg/ 2.65 - 11 lb per finger, which is an accessible entry point for beginners gradually strengthen tension levels, an easy and convenience way to build endurance in your hands, wrists and forearms^ Ergonomic design: these hand exercisers are design with ergonomic palm grip, which will provide you a customized conditioning for individual fingers, the entire hand, wrist, and forearm, secure and comfortable to use^ Fine workmanship: our finger strengtheners are made of quality plastic and springs, durable enough for you to exercise every individual fingers, as well as your entire hands, suitable for those who need finger power, like athletes, guitarist, pianist, accordion performer, violinist, hand reconstruction patient, etc.^ Package includes: you will receive 4 pieces of different levels of finger strengtheners in one pack, coming with 4 different colors for easy distinction, each hand exerciser measures approx. 8 x 9 cm/ 3.1 x 3.5 inch, the compact size and lightweight makes it easy for you to carry it along