The over liner is non-stick, easy to clean, and high temperature resistant. And it would be a great alternative to aluminum foil and aluminum sheet to keep your oven from baking. The oven liner for the bottom of the oven can keep your oven clean of messes and spills. You can use it as an oven protector, baking sheet or pan liner for electric and gas ovens, microwaves, kitchen stoves, toasters, grills, etc. It is constructed of fiberglass material. There are 2 sizes for you to choose from. Fits most standard size ovens or can be trimmed to fit your needs. Item Name: Oven Liner Material: Fiberglass Features: Non-Stick, Easy to Clean, High Temperature Resistant Size Details: Size S: 33cm x 40cm/12.99" x 15.75" (Approx.) Size L: 40cm x 60cm/15.75" x 23.62" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 3 x Oven Liners