1. 304 stainless steel cup body, colorful color matching, anti-wear and anti-scratch 2. 316L stainless steel liner, 0.12mm ultra-thin inner wall, locking temperature 3. Double-thread cup lid, sealed silicone ring, no water leakage when inverted 4. The small body of the cup can be held with one hand and easily put into the pocket 5. Built-in tea filter to block tea leaves