Designed with a 3-ply capsulated body for superior heat conductivity and even heat distribution. Flat bottom enables use on electric and gas stoves. 3-ply capsulated body: 1810 stainless steel interior (3040.4mm). Pure aluminum inner core throughout for optimal heat conductivity (Alum1.5mm). Premium induction stainless steel exterior (4300.6mm). Warranty: One-year parts and labor warranty. Customer must pay all repair and freight charges after warranty period. Warranty applies to residents of the United States only.