Surely, this is not more than a filling article considering the reasonable price. But... Is it reasonable? It is not more than a square sheet of 800 abrasive paper. And as I tried it out, I recognised, that it is maybe a bit too fine. It is not easy erasing the arrears on your frets or similar. I made the experience, that it is much more feasible, to just use a bit of steel wool and carefully bring new life onto the steel components of my guitars. Summa summarum: The product is usable, but maybe not necessary for everyone.If you are kean with handcraft, then just use what you have, e.g. steel wool. But of course, be careful not to damage the woods!