Aluminum is the perfect material for a baking sheet. It’s inexpensive, sturdy and light; it heats up very quickly and it’ll hold up to bashing. There are other options, though. You might see corrugated patterns cut in the sheet, or nonstick coatings made from ceramic or other materials. For more delicate baking, these may be enticing—or you can opt for a silicone baking mat. But if you’re looking to do a lot of roasting, stick to the basic, untextured aluminum—you want to maximize the surface area of the hot pan touching your food.