Check the listing for details. Starcke Premium 7 Inch Hook and Loop Sanding Discs Zirconia. Condition: New. Listed at 27.65 USD. * Size: 7 Inches No Holes ' 25 or 50 Pack ' Grit:36/40/60/80/100 * Premium Blue Zirconia grain on heavy duty polyester cloth backing for better cutting power, longest lasting performance * Hook & Loop backed sanding disc for use with backup pad * Exceptional results in wood floor sanding applications Specially engineered with tear-resistent cloth backing * Professional grade, German quality, stocked & shipped from the US. Starcke is family owned with over 100 years of experience in manufacturing abrasives. 7 Inch Zirconia heavy duty, durable, F-weight polyester cloth sanding discs. Faster cutting and longer life than standard Aluminum Oxide discs. Premium Aluminum Zirconia/Aluminum Oxide blend abrasive grain. Hook & Loop disc grips to the appropriate backup pad attached to an orbital or DA sander. High quality German industrial abrasives factory direct.