... a.double walls stainless steel 201 b.stainless steel 304 inner and 201 outter c.double walls stainless steel 3042.Material of lid and handle:TPR soft ... with development,design,and production as well as sale,we have products mainly such as:universal use vacuum heat preservation ... cup ,tour kettle,large mouth kettle,student cup,vacuum cup withouttail,spotrt canteen automobile cup,etc. We own ...