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, suit for violin 4 or 4 students or beginners or kids.High Quality, water proof,oil proof, with glue,Removable, will not leave glue when off.Easy to use: No need to loosen or remove the strings to put it on.This violin fingerboard guide stiocker decal have helped thousounds people to learn violin. It is one-picece back sticker, waterproof, oilproof,with glue,can stick and will not leave glue when off. to use,JUST IT OFF, PUT IT ON, AND PLAYproduct Fret finger guide sticker for violin 4 or 4.Colour:BlackMaterial:Pressure- 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 a little different from the real thing. The measurement allowed error is 1-3cm.