BlueFire™ H875P 17.5" x 2.75" 180 Grit Zirconia Alumina File Sanding Sheets (50 Pieces) by Norton®. Use the BlueFire H875P fine grit paper (pressure sensitive adhesive) file strip on your metal, wood, composite, and fiberglass sanding projects. The paper's non-stearated open coat design also makes it a great choice for auto and aerospace paint projects. The paper has an E-weight synthetically-coated construction, giving it a durability, chip resistance, and longevity you need to complete your projects. The zirconia alumina grain self-sharpens, meaning you get an improved cut rate while minimizing heat.