FOVERN1 Guitar Finger Expansion, Finger Sleeve Finger Force Span Practing Trainer TooL Training Bands for Guitar Bass Piano Finger Speed System Musical Instrument Accessories

【Finger Expansion--Finger hole diameter 20 mm】!Before placing an order, please confirm your finger size!Effectively solve the problems of soft and weak fingers, hand collapse, and insufficient finger span. You can practice four fingers or two fingers. Finger holes are 20mm/0.8inch.If you feel the finger holes are too small, you can tear down finger cots., 【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 high-quality and 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.