THE ROCK by Starfrit 3 Qt. Saucepan with Glass Lid and Stainless Steel Handles is made from unique, patent Rock.Tec manufacturing process. It uses small-metal-pellet impact technology to modify the surface to form an ultra-durable, rock-like finish. The result is an outstanding release performance 3 times better than traditional nonstick cookware. The extra-thick forged aluminum base give you everything you need for optimum heat distribution and ease of use.