It was deceived as long as 100 times longer than the sandpaper of product singing phrase 6 times sharpness. I bought it because I was planning to be cheap because it is cheap but it is splendidly. . . It seems like a mistake to compare with sandpaper in the first place. I did not use it for my own purpose, but I think that it is okay to use it, so I put it in the bottom of the tool box.