3M 36221 Sandpaper Roll, 2 3 4 in W x 90 ft L, Ceramic, 180 Grit, C Wt Paper, PSA, 321U, 5 PK AX43 000 hr Water Penetration Rating 000 hr Water Penetration Rating IPX4 Standards ANSI PLATO FL1 2019 Dry Erase Product Grouping Dry Erase Board Board Properties Magnetic Item Dry Erase Board Board Color White Dry Erase Surface Type Steel Mounting Mobility Type Mobile Casters Dry Erase Surface Finish Matte Board Frame Material Aluminum Frame Color Black Includes Mounting hardware Frame Material Aluminum Roll Grit 180 Roll Width 2 3 4 in Roll Length 90 ft Abrasive Material Ceramic Grit 180 Abrasive Grade Fine Backing Material Paper Backing Weight C Coating Coverage Open Attachment Type PSA Resistance Properties Load Color Blue Vacuum Hole Pattern Non Vacuum Country of Origin Canada PSA abrasives have a sticky backing that creates a strong bond when attached to a smooth surface backing pad