This is a 400ml office cup by WAOBA, made of 304 stainless steel, with a double-layer design for insulation and a transparent lid. 

Double-wall vacuum insulation design, can protect against heat or cold transfer, and keep your drinks be hot or cold for longer time. When filled with hot water, the cups will never get hot to touch! Screw lid, along with the silicone seal ring can avoid water leakage.