Neewer&reg; NW-05 Adjustable Hand Exerciser Finger Strenth Trainer for Guitar Bass Piano Sax Player (Black) This finger trainer is designed for all instrumentalists to develops the strength and dexterity of fingers, hands and forearms Variable tension provides customized conditioning for individual fingers Improve the strength and speed of your fingers and traning your fingers to be more nimble while playing musical instruments Perfect tool for warm up before playing Lightweight and easy to carry