Lifetime-Warranty spring structure with copper nut and screw
World First 5 pressing-keys exerciser to practice finger interval.
Visual adjustment, you can see the change while practicing.
Intensify your practice for specific finger with exclusive ''key-hold'' feature.
Widely used for finger exercise when you play guitar, piano or orchestral instruments.

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 1.57 inch
Height : 0.79 inch
Length : 1.57 inch

Item Weight: 0 ounce (View shipping rates and policies)
Shipping Weight: 4.8 ounce (View shipping rates and policies)

ASIN : B013HVMI2Q