What it is ?
it is simply a sticker, well-designed and high-quality thing, made of durable material. It is easy to instal on the violin fingerboard, you do not need any adhesive, you do not need remove strings to install it. The entire sticker is transparent - you can see only the colored stripes. From a distance it is almost invisible.
Do you need it ?
Of course - for those who play the violin well - such things do not need to, but for beginners, i think - it's just necessary. I teach children to play the violin, so with stickers on - is much easier to communicate with the student.
How to remove it ?
I do not tried to remove the following label off, so I can't say whether it is complicated. But it's just a sticker, I think everything will be fine :)