This is a set of two DuraSand Coarse Grit, Double Sided Sanding Pads. Professionals of all kinds have found a wide variety of uses for these sanding pads. They can be used dry or with water and if they get dirty, you can bang the pad on your hand or your workbench and knock the particles out. If it gets to the point where you think the pad is clogged beyond further use, head to the sink and wash it out for almost new performance! This allows you to get the most out of your dollar!4 3/4 x 3 7/8 x 1/2"