Product advantages: bright color 304 stainless steel inner tank long-lasting heat preservation Healthy material Safe to use Integrated seamless inner tank Smooth and no dirt concealment, sealed leak-proof, small mouth, comfortable feeling.The vast caliber does not leave dirt, brewing does not spill, easy to clean, and does not leave dirt.All azimuth seals are leak-proof and built-in silicone sealing rings are easy to carry when going out