Tri-Ply Copper Cookware - This is not just ordinary Tri-Ply cookware! The cookware is 2.5mm thick and the copper is ONE mm thick verses all competitors at .005 mm thick. The sizes are designed to optimize family cooking at it best. The 18/10 Stainless steel along with the solid core make the total thickness 2.5mm which is the optimal cooking thickness.. TRI-METAL COOKWARE SALE