Our Arbor Band Sandpaper is available in four diameters and three grits: fine, medium, or course. Fine (120 grit) Medium (80 grit) Coarse (60 grit) Arbor Bands are designed for aggressive trimming and finishing of acrylics, silicone relines and other materials. Arbor band mandrels are made of high quality materials with adjustable diameter rubber heads, designed to firmly hold the arbor band sandpaper in place.