Ideal for removing seams as well as shaping, sanding and polishing surfaces. This sanding block is great for sanding both flat and round surfaces. It contains four different grades of sandpaper starting from coarse (no. 3) to very fine (no. 0). You will usually want to start surface no. 3 when large amounts of material need to be quickly removed. After use surfaces no. 2 then 1 finishing with 0 to polish the surface smooth. After sanding remove the film or dust from the sander using soap and water.