Replaces red floor pads (formerly Scrub-Grit® II). For medium to mildly aggressive cleaning of ceramic tile, concrete, marble, non-slip flooring, quarry tile, rubber, slate, terrazzo, and VCT. Irregular bristle length to assure cleaning on uneven surfaces. 1.5" nylon fibers impregnated with 320 grit silicon carbide. Available in 11" - 20" diameter showerfeed blocks with 1" trim. Great for grout lines less than 1/2" width.