I used papers exclusively for crossing so far, but I tried using 3M's paper this time. Because the particles of paper are made of ceramic from ordinary aluminum, it is very easy to hold and you can polish easily without putting strength! Previously, I bought No. 120 and the back paper was thin, but No. 80 is a reasonable thickness so it's easy to use. Although the price is a bit higher than the exclusive item, it is a very excellent product considering work efficiency and possession. Coworkers' craftsmen are also acclaimed!