1pcs Vacuum Insulation Stainless Steel Cup. 17 oz Travel coffee mug size: 6.7x2.76inch, About 0.75 pounds each. The vacuum insulation made of high quality professional grade 304 double-layered stainless steel, durable and also keeps drinks odor free. It is designed to make sure your hot and cold drinks stay at the perfect temperature for 6–8 hours. The vacuum stainless steel insulation ensures that temperatures are maintained, keeps hot / iced beverage & drinks up to 3-6 hours. When you are driving, in office or at home, if the reusable coffee cup topples on the floor, it will not spill or leak out. The lid will remain tight.