The new design uses more copper. The highlight of our frying pan is the 3.5 mm thickness. The copper exterior is 1.5 mm, the aluminum core is 1.5mm, and the stainless steel interior is 0.5mm. Home chefs that love conduction in their pan will cherish this everyday use item. The aluminum core is a good compromise (over copper ore). This pan will heat quickly on the stove but also cool fast to prevent burning. The 11-inch frying pan excels in browning meats and for sauteing vegetables. Our pan has a 2" sloped side for easy stirring. The classic elegance of the copper bottom will tarnish into a heirloom tarnished patina that has been cherished by mankind for ages. Brighten up your life with the glow of copper.. The stainless surface interior is easy to clean and is neutral. This pan requires very little oil and promotes healthy cooking. Delicious gourmet entrees promote small helpings and cut down on caloric intake. The pan cleans easily. Ergonomic riveted handles allow for robust use.