A great tool to learn Violin, the fret markers replace the tapes on the fingerboard of teaching fingerings to beginning string students.Great for the classroom teacher or private studio teacher, aso suit for violin 4/4 students or beginners or kids.High Quality, water proof,oil proof, with imported glue,Removable, will not leave glue when peel off.Easy to use: No need to loosen or remove the strings to put it on.This violin fingerboard guide stiocker decal have helped thousos people to learn violin. It is one-picece back sticker, waterproof, oilproof,with imported glue,can stick very well and will not leave glue when peel off. Very EAZY to use,JUST PEEL IT OFF, PUT IT ON, AND PLAYproduct DescriptionFret finger guide sticker for violin 4/4.Colour:BlackMaterial:Pressure-sensitive adhesivePackage Contents:1 x Finger Guide StickerOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.