Size: 9*8cm Color: black, blue, green, orange Material: ABS Package content: 1 pcs Main function: 1. 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, which will provide you a customized conditioning for individual fingers, the entire hand, wrist, and forearm, secure and comfortable to use 3. Fine workmanship: our finger strengtheners are made of quality plastic and springs, durable enough for you to exercise every individual finger, as well as your entire hands, suitable for those who need finger power, like athletes, guitarists, pianists, accordion performers, violinists, hand rehabilitation patients, etc. 4. finger trainer with a solid structure. Finger trainers consist of springs and new ABS plastic, are comfortable to hold and easy to train, do not injure your fingers, are durable and have a longer service life than other finger trainers used in occupational therapy. 5. Extremely portable design, easy to carry. You can carry it in your luggage, bag, purse, etc. The slim size allows you to hold everything in the palm of your hand and make it portable for exercising your fingers whenever you want. Note Please allow 2-3 cm difference due to manual measurement. Besides different computers display colors differently, the color of the actual item may vary slightly from the below images, thanks for your understanding (1 inch = 2.54 cm)