The inside of this 12 oz thermos mug is made of 304 stainless steel, the bottom is eggshell-shaped, and the double-walled design can keep your drink hot or cold for up to 12 hours, so you won't feel the temperature when you hold it in your hand. Measuring 4.41" x 3.07" x 3.07", the smooth, sleek puff design is perfect for all types of outings or offices. There are a variety of colors to choose from and support for custom logos, which is perfect for corporate gifts and self-promotion items. The product comes with a clear plastic lid, and the unique overall design makes it easy to clean and carry. The prices for 1000pcs or over are based on ocean shipments.