folding cup,stainless steel mug ,coffee mug ,thermal cup folding cup , lens mug ,stainless steel mug ,coffee mug ,thermal cup ,creative mug1:1 Model ... as cover. can hold cold and hot liquids. Stainless Steel inside Can also be used a pen holders! Materials ... : Food Grade Plastic with stainless steel interior as a thermos. folding cup ,thermal cup,stainless steel cup ,creative cup