Check the listing for details. Starcke Premium 4 Inch Hook and Loop Grip Sanding Discs Black Silicon Carbide. Condition: New. Listed at 16.94 USD. * 4 Inch No Holes ' 25 or 50 Pack ' Grit: 36/60/80/120/220/320/400/600/800 * Premium black Silicon Carbide grain on heavy duty E-weight paper backing for a precise and uniform finish * Hook & Loop backed sanding disc for use with backup pad * Exceptional results in dry sanding finishing applications for stone, wood floor, metal, autobody, paint, primer, plastics, marine, composites and cultured marble * Professional grade, German quality, stocked & shipped from the US Starcke is family owned with over 100 years of experience in manufacturing abrasives 4" heavy duty E weight paper sanding discs. Super sharp and fast cutting Silicon Carbide abrasive. Hook and loop grips to backup pad attached to an orbital or DA sander. Used for dry sanding on natural stone, plastic, fiberglass and concrete. High quality German industrial abrasives factory direct.