Scouring Stick, Pumie, gray pumice, 5-3/4″x3/4″x 1-1/4″. Erases stains on porcelain, ceramic tile, concrete, ironware, and other hard surfaces. Non-toxic, more effective than chemicals and cleansers. Multipurpose cleaner erases grime, carbonized foods, paint or other unwanted deposits. Non-toxic, safe in all working environments. Non-reactive. Cleans rust from tools, grime in work areas, baked on foods, grease and carbon buildup.