Orange Color Variable Tension Hand Finger Exerciser Grip Trainer for Ukulele/Guitar/Bass/Piano/Saxophone/Violin/String/Wind Instrument Musicians

Features: 1.World First 5 pressing keys to practice finger-interval. 2.Precise design for spring structure with copper nut and screw, and the product has a lifetime warranty. 3.Visable physical force adjustment, you can see the change while you...