Sold as a pack of 3 Units. Each unit measures 5.75" x 2.75" x 2.75" 100% pure pumice. Jumbo size brick for large surface cleaning. Removes lime, scale, rust and paint from hard metals, porcelain, ceramic tile, concrete, masonry and stone. Restores farm equipment, garden and workshop tools. Cleans pools and barbeques. Works easily dampened by water or oil. Chemically neutral. Safe for skin . Manufacturer number: JPS-12. SKU #: 17609. Distributed by United States Pumice Co.