proper use and maintenance are key!For gas and electric ovens with a hidden heating elements, place the oven drip mat at the lowest rack of the oven and not on the oven floor. For electric ovens with an exposed heating elements, place them underneath the heating elements at the bottom of the oven. Wash them with soap and water before using them for the very first time. customsize the size and shape of your large oven liners to fit any oven or air fryer. Simply trim them to size or tile them together for larger ovens. They're perfect for all sizes of ovens and air fryers. keep your oven spotlessly clean with our non-stick copper oven liners! They catch drips, cheese, sauces, and other baked messes, making cleaning a breeze. Plus, you can wash them in the dishwasher for easy maintenance. cost-effective: An oven liner is an affordable way to extend the life of your oven and reduce cleaning time. not just for ovens! Our oven mats can also be used as pan liners, air fryer liners, grill mats, baking mats, cooking sheets, or gas stove protection pads.