A necessity for any chef's kitchen. Baking professionals know that the secret to evenly-baked and perfectly browned food is to cook with aluminum bakeware. Aluminum is widely known for its excellent heat conductivity and cooks more evenly and thoroughly than other metals. Made of natural aluminum with no finish, the Baker's Half Sheet is the largest baking sheet on the market, measuring in at 13"x 18" x 1", yet still fits within standard home ovens. Turns out perfect results every time, whether you're making bars, brownies, or cookies. Convenient lid for transporting and storing your baked goods.