Full colour dye sub printed mug with a heat sensitive coating. When hot liquid is added this coating becomes transparent revealing the image underneath. As the mug cools the heat sensitive coating restores to its original colour. Hand Wash Only. Height: 90mm. Diameter: 80mm. Print area: 216 x 92mm. Price includes 4 colour process dye sub print on a mug with a white interior and a black or dark blue exterior. The WoW Mug can also be screen over-printed with a permanently visible message at extra cost.