this is vacuum flask.inner stainless steel.outer PP plastic.
Detailed introduction to stainless steel thermos flask:
Brand name:HONGKANG
350ML: Meas:73*39*22 cm N/W15KGS G/W16KGS 50pcs/ctn
500ML: Meas:73*39*25.5cm N/W18KGS G/W19KGS 50pcs/ctn