Washable and reusable. Dual grit to cover multiple project requirements and angled edges for corners and hard-to-reach areas. Ideal for sanding and finishing most materials. Use on wood, paint, varnish, plaster and filler. Using high density sponges as base material, the resilience is excellent, plasticity is strong, and it is not easy to tear. Meddium/Fine Use on wood, paint, varnish, plaster and filler. The Sanding Sponges are portable and handy, and suitable for polishing flat and irregular surfaces.