Description: 100% Brand new and high quality. 5 pressing keys to practice finger-interval Precise design for spring structure with copper nut and screw Visible physical force adjustment, you can see the change while practice Intensify your practice for specific finger with exclusive "key-hold" feature Widely used for finger exercise when you play guitar, piano, bass, ukulele, saxophone, violin or orchestral instruments Size Chart: 10.4*6.5*2.3cm Package Includes: 1 x Finger Trainer
