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.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.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.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.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.