The Norton ProSand Drywall Corner Sponge, Medium Grit (4-1/2in x 2-3/4in) is an ideal corner sponge. Experience the ultimate in sanding performance with our cutting-edge abrasive technology and innovative coating process. These sponges are engineered to prevent clogging, delivering faster cutting action and an extended lifespan compared to standard sanding sponges, surpassing conventional sandpaper's longevity by up to 5 times.