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 endurancein 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, including red, blue, black and green, 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 4 Pieces finger strengthener hand exerciser trainer spring-loaded hand grip finger exerciser tool for guitar practice rock climbing training and physical therapy Individual fingers training deign: For disciplines like climbing or music, training individual fingers may be critical. If youve never tried a finger strengthener, you may be surprised at how relatively weak some of your fingers are. Our hand grip finger exercisers are designed to solvethis situation, which is a training program that encompasses all the fingers, isolating and exercising each finger individually for strength, dexterity, and endurance. Suitable crowd: This set of finger strengtheners with different strengthen tension levels, from X-light to heavy, including 1.2 kg/ 2.65 lb, 3.2 kg/ 7 lb, 4.1 kg/ 9 lb, and 5 kg/ 11 lb, is a good option for beginners to grip, and gradually strengthen tension levels,also suitable for people who are looking to target individual fingers. Ideal for athletes, guitarist, pianist, accordion performer, violinist, hand reconstruction patient, etc. Specifications: Material: plastic and spring Color: red, blue, black, green Size: 8 x 9 cm/ 3.1 x 3.5 inch Package includes: 1 x X-light finger strengthener (2.65 lb per finger) 1 x Light finger strengthener (7 lb per finger) 1 x Medium finger strengthener (9 lb per finger) 1 x Heavy finger strengthener (11 lb per finger)