Straight Sanding Sponge: Made with an open cell foam which allows the adhesive to bond with both the foam and grain in a very consistent manner ensuring lasting performance. Premium-quality P-Graded. Aluminum Oxide for optimal results. 2-grits on 4-sides of sponge. For flat or curved surfaces. Long lasting. For wet or dry sanding. Can be rinsed and reused. Less hand fatigue. Med/Fine Grit. 4″ x 2-5/8″ x 1″.