Come and see our amazing products! This color changing mug is made of quality ceramic. features two designs, cold Mug and hot mug. The ink used on the cup is non-toxic, pollution-free and pollution-free, and synthesized by biological materials. FDA certified. Your images and texts printed invisibly on full wall will show off when the water temperature reaches 104 Fahrenheit degree and above for hot mug; and will show off when the temperature reaches 68 Fahrenheit degree and less for cold mug. No limit on number of colors or number of images that can be printed on the mug. To do your logo part visible and other part invisible is available, these parts form a complete logo when water goes in. Pls confirm with us about the packing info, stock color and exact production time before placing your order