3M 6" 363I STIKIT IMPERIAL RESIN BOND "F" WEIGHT SANDPAPER ROLLS 363I - A tough and durable aluminum oxide mineral bonded with a full heat resistant resin to a strong "F" weight backing. The backing provides excellent shelling and tear resistance, thus increasing the life and performance of the disc. Excellent for scratch refinement after coarse sanding. Disc is 6" x No Hole. Product is sold by the roll of 100 discs. 4 rolls per case.