Finger Expansion,Flatsons Adjustable Guitar Finger Expansion Finger Force Span Practicing Trainer for Guitar Bass Ukulele String Instrument Beginner

Four rings are placed on the slide rail, designed to expand fingers' gap for large span tune playing.

You can easily adjust the trainer finger rings to appropriate distance with scales to fit your finger via screws.

Thick rubber and round edge rings can protect fingers more from long time exercising stress.

Widely applicable for guitar, bass, ukulele, piano, cello, viola, violin, flute and wind instrument, etc.