Silicon Carbide 991A Black 9" x 11" Wet/Dry Paper Plain Sheet P400 25ct Retail Pk R 991A-P0400-R25 Starcke #: R 991A-P0400-R25. Light, A weight plain backed full 9 x 11 sheet for hand sanding.. Exceptional results in wet and dry sanding finishing applications for metal, autobody, paint, primer, plastics, marine and composites.. Specially engineered top waterproof product for wet sanding.. Professional grade, German quality.. Stocked & shipped from the US. Starcke is family owned with over 100 years of experience in manufacturing abrasives. 991A-0400-R25