... can be customized 5.FDA Features1.Material:double walls stainless steel 201/304,according to client's design. ... : special for dual usage of stopper of internal spourt for easy pouring. 5.Rubber soft stretch ... as sales,we have products,mainly such as stainless steel vacuum flask, coffee pot, mug, auto mug ... available.Expectting for our cooperation!!! stainless steel double-layer vacuum flask/thermos cup