... :double wall construction,18/0 or 18/8 stainless steel is available,all according to client's request. ... 2.Double walls stainless steel and high vaccum make it insulated from outside, ... well as sales,we have products,mainly such as stainless steel vacuum flask, coffee pot, mug, auto mug, ... long-term cooperation. BPA free double walls stainless steel vacuum coffee kettle pot