... vacuum flask 2.double walls with unbreakable structure 3.high vacuum insulation 4.color and logo can be customized 5.FDA Features1.Material:double walls stainless steel ... as well as sales,we have products,mainly such as stainless steel vacuum flask, coffee pot, mug, auto mug, sports bottle, ... the price is available.Expectting for our cooperation!!! stainless steel double-layer vacuum flask/thermos cup