This jumbo scouring brick is used for large surface cleaning. Removes lime, scale, rust and paint from hard metals, porcelain, ceramic tile, concrete, masonry and stone work. Restores farm equipment, garden and workshop tools. Cleans pools and barbecues. Chemically neutral. Safe for hands. Safe to use and store around children and animals.100% pure pumice for the tough jobs. Works through abrasive action on dry or wet surfaces. 5-3/4″ x 2-3/4″ x 2-3/4″.