SPACE-SAVING STACKABLE TRAYS: Sleek, stackable design allows for compact storage in kitchen cabinets, fits conventional ovens, toaster ovens, and countertop ovens. OVEN SAFE TO 230 degree celcius: Built to withstand high heat up to 230 degree celcius, good for making everything from gooey brownies to crisp cookies or savoury pies and traybakes.