Pumie® is non-toxic and cleans rust, hard water scale and mold stains from porcelain, ceramic tile, concrete and masonry faster than cleaners and chemicals. Used by millions for over 75 years. Safe in all working environments. Erases grime, carbonized foods, paint or other unwanted deposits. Scouring Pads/Sticks Type: Stick; Material(s): Pumice; Size (W x L): 6 3/4" x 1 1/4"; Color(s): Gray.