Sanitary & safe material: Made of nonporous pumice stone mixed with other abrasive material, these stone grill cleaners are non-, odorless, recyclable and don't absorb grease. No residue or smell : Our grill stones are made up of quality materials which effectively and effortlessly remove all stains from your griddles or grills without leaving behind any residue or odor, No bristles or spikes to break off and get into the food, cleans the grill much easier than brushes.