Simply Calphalon Nonstick Bakeware, Baking Sheet, 12-inch by 17-inch 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. Toffee colored nonstick finish is beautiful and practical. The lighter color makes it easier to prevent overbrowning. Reinforced rolled edges prevent warping. Dishwasher-safe and protected by a full 10-year warranty.