1) .304 stainless steel 2) 1.2mm for the cooker body and lid ,5.0mm for the bottom 3) Warranty period 3 years GS CE About products,(1) Material :stainless steel (2)Sandwich bottom :5.00MM thickness 1.2MM for the cooker body and Lid (3) It can work on all cooking tools, such as gas stove, electric stove ,microwaveoven, solar stove..(4Bakelite handles (5) Warranty period : At least 3 years