Material: Food grade 304 stainless steel material + food grade PP, ,Size: 3.3"*6.6"/3.5"*5.9", ,Feature, 1. Two sizes for you to choose, the large capacity of 600ml, the small capacity of 350ml, you can choose according to your needs., 2. Made of high quality stainless steel, food grade stainless steel inner liner, the outer wall of the liner with a heat insulation layer, vacuum locking layer, heat preservation effect is good., 3. Straight drinking mouth and straw design of the bottle cap, easy to drink, clean and hygienic; equipped with two different shapes of straws, the bottle cap is equipped with an air release valve to ensure air circulation, easy to drink, safe and non-toxic., 4. Whether hot or cold drinks, with it whenever you can ensure that your drinking experience, cold drinks insulation time of up to 18 hours, hot drinks insulation time of up to 6 hours., 5. Suitable for home, office, sports, travelling, road trips, barbecues, camping, parties and more. You can give them as a gift on birthdays, festivals is also especially suitable.