The BETTER GRILLIN' Scrubbin' Stone is an eco-friendly scrubbing block is made with recycled cellular glass allowing you to easily remove encrusted or burnt on grease, grime and dirt from your many of your hard to clean cooking surfaces. The SCRUBBIN' STONE can be used to safely and effectively with the bonus extension handle to clean Grills, Griddles, Cast Iron Skillets, Cooking Pans, Cookie Sheets, Dutch Ovens, Pizza Pans, Oven Trays and more. It is safe to use on iron and stainless-steel. You can make a stainless-steel grill grate look like new. The recycle glass that is chemical free, steel wire free, bacteriostatic and non-toxic. (Bacteriostatic means inhibits the growth or reproduction of bacteria) It does not grow mold or bacteria like other cleaning products can. Use on hot, warm, or cool surfaces. Works best and safe on a warm surface. Take the hard work out of cleaning your grill with the BETTER GRILLIN' Scrubbin' Stone. Additional safety information to consider. SCRUBBIN' STONE is made of only transparent, flat window pure glass, to avoid dangerous substances like lead, arsenic, cadmium. We do not use recycled glass from chemical or pharmaceutical industries or use recycled glasses, which are chemically tinted or treated to contain acidic or corrosive substances like other manufactures. SCRUBBIN' STONE are closed cells. As a result, microorganism (bacteria, fungi) cannot live in them. This will be 1 purchase you are glad you made. Color: Light Gray Clear Glass.