The outside of this cup is composed of 201 inside using 304, the cup is very portable, you can add ice in the summer in the cup can stay cool for 6-12 hours, this cup is also very suitable to put in the car, more perfect use of space, in addition he not only keep cold can also be insulated, summer do not Great for promotional giveaways, each cup can be customized with your logo or name for maximum brand awareness! Made from stainless steel material, measuring 21oz, this custom 21oz-tumbler-vacuum insulated double. Usage Scenarios: Office supplies, school stationery, corporate promotions, trade show giveaways. We offer logo printing and full packaging customization. Product Highlights: BPA-free, leak-proof, travel-friendly.