RIPRO Cleaning Stone Removes stubborn water stains, rust, yellowing, and urine scale from toilet bowls, etc. - Gloves and storage bag are unopened. - Abrasive sponge: 1/3 of one sponge from a set of two has been used. - Stone: A small amount from the corner of one stone from a set of two has been used. Please check the material you wish to polish carefully, as scratches may occur. Scale and water stains came off well. Due to the thickness, it will be shipped in simple packaging.