The 3M™ Sanding Sponge is a medium grit sanding block designed for versatile use on various surfaces. It features a block shape that makes it easy to hold and sands flat, contoured, or irregular surfaces. The sponge is made with durable, flexible foam and is compatible with conventional 3M abrasives. For optimal results, it is recommended to sand with the grain of the surface and work through a sequence of grits, from coarse to very fine, skipping no more than one grit between each sanding step. This sanding sponge is ideal for both dry and wet sanding and can be rinsed and reused after use.