Training Board: You can train your fingers anytime, anywhere, anytime. Effective not only for piano, but also for pulling other instruments. You can overcome the weaknesses of your fingers. This is an essential tool for training your fingers. Especially recommended for those with small hands or those with slow knitting speed. Small hands and fingers wont open Fingers wont move fast. Does not contain volume. The joint structure is weak and the fingers do not fix. 4. Does not raise fingers.