These are grilling stones specifically for gas grill trays. Placing them in the fish-grilling tray of a gas stove efficiently absorbs grease, drippings, and other debris. They also provide a nicely browned finish due to radiant heat. - Product Name: Grill Friend - Purpose: Grilling stones for gas grill trays - Contents: 360g - Model Number: GF-1 - Quantity: Set of 5 Unused, but the outer box is damaged.