3M Elek-Tro-Cut Cloth - 9" x 11" - 220j GradeSold in sets of 50 Pyramid like abrasive structures minimize heat build up that results from dull mineral gouging the substrate Ideal for intermediate finishing and fine polishing prior to plating or buffing Pyramid like structures contain abrasive mineral that cuts cleanly through the substrate, producing finer finishes than conventional abrasives Resin bond helps abrasive withstand heat Semi flexible backing for consistent finish over contours