... 2K AB Grade black glazed ceramic coffee mug with silicone lid !!23 years abandant expericens in color changing drinkwares!Free samples ... a sole-invested company specializing in the production of color changing mug. It is located in Shenzhen, Established ... and stainless steel, etc.Business scope: ceramic, glass, stainless and plastic color changing mugs!Color changing, non dis-colouring, four colors ...