Imperial Wetordry Sheets 9 in x 11 in P600-grit.Available in grades P220-P800 and 1000-2500 9 inch x 11 inch sheets. Grades P220-P800 have aluminum oxide coated on A weight backing. Applications Grades P220-P800 are designed for sanding primer primer surfacer fine feather edging and sanding old finishes. When used with water both of these products cut fast last long resist loading and leave behind a consistent scratch. 50 sheets per sleeve.