Product descriptionSize: 9 * 8 * 2.5 cmColor: black, blue green, orangeMaterial : ABSPackage Content: 4 * Grippers 1. Main Function: Our finger strengtheners are designed to develop and maintain the strength and dexterity of your fingers, hands and forearms.2. Ergonomic Design: These hand exercisers are designed with ergonomic palm grip that gives you customized conditioning for individual fingers, whole hand, wrist and forearm, safe and comfortable to use 3. Good workmanship: Our finger amplifiers are made of high quality plastic and springs. They are durable enough to train each finger as well as your entire hand. They are suitable for those who need finger strength, such as athletes, guitarists, pianists. Accordionist, Violinist, Hand Reconstruction Patient, etc.4. High quality finger trainer with solid structure Finger trainers are made of high quality high quality spring, new ABS plastic, comfortable to hold and easy to triage, will not hurt your fingers, durable and has a longer service life than other finger trainers in occupational therapy.5. Extremely Portable Design Finger Exercise Piano, Easy to Carry You can carry it in your luggage, pocket, purse, purse, etc. The slim size allows you to keep everything in the palm of your hand and makes it portable to exercise your fingers whenever you want.