STHIRA sanding sponge blocks help DIY users, car owners, artists and crafters prepare surfaces by hand. The flexible foam follows curved edges and contours more easily than rigid sanding tools. Use this sanding block for car panels, trim preparation, woodworking, metal finishing and craft projects. Suitable for wet or dry sanding when the surface and abrasive are used according to the project requirements. The 20-piece assortment provides a range of abrasive levels for removing light imperfections, smoothing surfaces and refining finishes. These foam blocks offer a practical alternative to loose sandpaper or emery paper, with a shape that is easy to hold during detail work. Start with a coarser grade for material removal and move to finer grades for surface refinement. Brush away dust between grades, keep wet-use pieces clean, and allow the blocks to dry fully after use. Artists can use them as sand paper for artists, while woodworkers can use them as sand paper for wood.