Grill Brick: Prevents the spread of harmful dirt - won't absorb liquids or steam; made from heat-treated glass; Ecologically sound, green product, harmless to health, non-allergenic, non-toxic, odorless This barbecue grill stone cleaner is better than a grill brush, gives fast and efficient cleaning of BBQ grills, racks, griddles & other utensils made of steel or iron; made from heat-treated glass Gently rub this grill cleaning brick on a warm or cool surface to clean, then wipe the surface with a damp cloth; 2-time use per stone for a heavily dirty grill and 6-8 uses per stone for maintenance cleaning Made of 100% glass heated and treated in a method similar to the formation of volcanic pumice stone; this cleaning grill stone block wears down much like pumice stone; no more messy wire brushes The Grill brick wears down over time and can scratch some surfaces; but Scrubbing Stone Grill block is extremely lightweight but strong enough to be used as an abrasive; and like pumice stone