Norton Angled Sanding Sponge, Dual Sides, Aluminum Oxide Abrasive Material, Medium/fine Grade, Gray Color. Firm Sponge With Angled Sides For Sanding Inside Corners And Crevices Of Hard-To-Reach Areas On A Variety Of Materials. Coated 4-Sides. 4-7/8"l X 2-7/8"w X 1"t.