25ct. Contractor Pack of 5-220 grit, 10-320 grit, and 10-400 grit. 9 x 11 Inch high performance Silicon Carbide, closed coat waterproof sanding sheets with a resin over resin bond. A-weight flexible paper backed sanding sheets, long soak not necessary. Water prevents clogging and allows for dust free sanding Ideal for sanding primer, putty, filler, lacquer, and final painting/surface prep. Use by hand or attach to high speed vibrating sander 9 x 11 Inch | 25 Pack | 5pcs-220 grit, 10pcs-320 grit, 10pcs-400 grit Premium black Silicon Carbide grain on waterproof (wet & dry) flexible A weight paper backing for a precise and uniform finish Plain backed sanding sheet for hand sanding Exceptional results in wet and dry sanding finishing applications for stone, metal, autobody, paint, primer, plastics, marine, composites and cultured marble. Specially engineered top waterproof product for wet sanding Professional Grade - German Quality