Material:sponge Abrasive:silicon carbide Character:flexible and soft,ideal for dry or wet grinding ... sponge block, sponge sanding block, abrasive polishing blocks Material:spongeAbrasive: silicon carbideCharacter: flexible and soft, ideal for dry or wet grinding ... , paint, wood, plastic for fine grit products.Size: 100x70x25mm grey silicon carbide abrasive sponge sanding block