The top pan is designed with curved sides, allowing spatulas and whisks to glide smoothly for perfect blending. The bottom pan is a real workhorse, with a tough encapsulated base consisting of a thick aluminum core for quick, even heat distribution. 18/10 stainless steel with non-reactive cooking surfaces and polished exteriors. Glass lid is tempered and oven safe to 450 degrees F and fits either pan. 2 quart capacities for both the top and the bottom.