Patented Scotch-Brite™ Radial Bristle Discs are molded plastic discs embedded with a blend of 3M Cubitron™ and aluminum oxide. The abrasive-filled bristles apply a continuous supply of minerals to the work piece, eliminating the need for separate compounds and reducing dust. Flexible bristles reach into grooves and contours to clean and polish irregular surfaces. For lab hand-pieces in three color-coded grits. 3/4" Handpiece Radial Bristle Discs come 12 discs per package with one 3/32" handpiece mandrel. Please specify color when ordering.