Finger Expansion:Effectively solve the problems of soft and weak fingers, hand collapse, and insufficient finger span. You can practice four fingers or two fingers. And Ring is 45° rotatable. Increase Span:This tool can help you quickly open your finger and increase the span; stretch the ligament and increase the strength to make the finger softer; continuous training can improve basic skills and exercise your fingers. Ergonomic Design:The adjustable design is more ergonomic; it brings you the comfort of imagination. The finger position is made of soft silicone material, which is comfortable and convenient to use. Easy to Carry:The finger cots are made of Silicone, ABS, 304 stainless steel environmentally friendly materials, with strong toughness, not easy to damage, reliable quality, and can be used for a long time, practice, and use anytime, anywhere. Fingers Practicing Device: Open the finger joints to make string pressing easier. An essential artifact for stretching fingers and practicing musical instruments, suitable for guitar ukulele, violin, piano beginners.