Calphalon Contemporary Nonstick 12-inch flat-bottom wok is the perfect stir fry pan. Heavy gauge 98.7% pure aluminum gives great conductivity, while the advanced 2-ply nonstick surface allows for low/no fat cooking. Unique tulip shaped design looks great and cleans up like a breeze. Safe with nylon or wood utensils--a Calphalon nylon stir fry scoop does a wonderful job. Use medium to medium-high heat for best results when stir frying- high heat really isn't needed because the aluminum conducts and retains heat so well. Flat bottom works wonderfully on flat surfaced cook tops (glass, ceramic). Lifetime warranty.