NO NEED TO GREASE: the double ceramic coating ensures effortless cleaning and release, reducing the need for unhealthy greasing. ROBUST CORE: its made of carbon steel, with rolled edges for easy handling, and diamond dimples to promote air flow and even browning. STACKABLE: Smart Ceramic stackable baking tins nest together in the space of this large roasting tray, saving valuable cupboard space. USEFUL INFO: BPA, PFOA and PTFE free; heat resistant to 400 (752); dishwasher safe; lifetime guarantee (5 years' non stick guarantee).