Calphalon Nonstick Bakeware, Cookie Sheet, 2-Piece Set Heavy-gauge steel core won't warp and heats evenly without hot spots so your cookies and cakes come out of the oven perfectly and evenly browned. The interior of each piece has interlocking non-stick layers that are designed to deliver long-lasting, high-performance release. Releases up to 2X better than Calphalon Classic Bakeware. Nonstick finish is beautiful and practical. For cookies, dinner rolls or other baked goods, reach for an all-purpose cookie sheet from Calphalon. The two upturned ends are for lifting; open sides allow items to slide right off. Dishwasher-safe and protected by Calphalon's full lifetime warranty.