Wetordry Imperial Sheets, 600 grit, 9 in. x 11 in, A Weight, 02036 (50/Pack)Wet or Dry Black Abrasive 9" x 11" Sanding Sheets, 600 Grit 50 Pack Used in wet sanding, use for scuffing the blend area prior to painting. Most flexible backing with more consistent scratch pattern make this 3Ms best wet sanding product. A Weight Paper Backing Abrasive Mineral: Aluminum Oxide Sanding Surface: Clear Coat, Fiberglass, Paint, Plastic, Primer Used in wet sanding, use for scuffing the blend area prior to painting. Most flexible backing