1.Double wall vacuum stainless steel 2.many colors ... least 24hour... 4.Capacity:350ml-500ml Features1.Material:double wall construction,18/0 or 18/8 stainless steel ... available,all according to client's request.2.Double walls stainless steel and high vaccum make it ... of stainless steel vacuum insulation cups, thermos bottles, sports pots, office cups, sports cups, vacuum cups, coffee pots, auto glasses ...