About this item ?【Double-wall Insulation Technology】：The tumblers with lids and straws are double wall and vacuum insulated. The Double-Wall Vacuum insulated thermal technology provide a good ability of insulation, which is good for keeping your drinks warm or cold for a long time and protects your hands against the temperature of the drinkings inside the tumbler cup, so you can use the insulated tumbler in any season. ?【Food Grade Material】：The stainless steel insulated cups are made of 18/8 food grade 304 stainless steel, with powder coated finish,don't worry about peeling or rusting. Light weight and unbreakable,also easy to wash and carry. ?【Leakproof Lids Design】：Stainless steel tumblers with bpa-free lid is designed with a hole for easy straw use and the hole in the mouth of the cup can also be covered to prevent liquid from spilling out and not splashing on clothes. The black silicone rubber ring makes for a better seal. ✨【Multi-functional Tumbler】：The insulated tumbler cups can be used as wine cups, coffee cups, water cup or sports fan travel mugs, and are suitable for storing any drinkings. The tumblers with lid is a trendy colored stainless steel tumbler cup, your best choice in home, office, camping, holiday, sports, travel. The insulated tumblers also makes a a stylish and ideal gifts for Birthday, Christmas gifts, Valentine's, Mother's or Father's Day! ?【Packaging Includes】： 4*Stainless Steel Tumbler + 4* Tumbler Lid +8*Straw+4*Straw brush; Our insulated tumblers cup have undergone strict quality inspections.If you have any quality problems with your purchase, please contact us. Your satisfaction and love are our greatest encouragement.