Calphalon Nonstick Bakeware 12-Cup Covered Cupcake Pan, 9" x 13" 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. Ideal for muffins, cupcakes and even corn bread. The protective cover helps preserve freshness and makes it easy to transport. Dishwasher-safe and protected by Calphalon's full lifetime warranty.