Hot Cold Heat Sensitive Color Changing Coffee Mug Product Features Heat sensitive morphing mug unique zombie design. Ceramic mug 100% non-toxic. Cool gift for the walking dead fan. High quality 100% non-toxic 11oz ceramic mug good for both cold and hot liquid. Heat sensitive color changing mug stay black with cold and zombie appears with over 70°C/158°F hot liquid. Cool zombie mug great Christmas/birthday gift for the walking dead fan zombie lover. Hand wash only use in microwave or dishwasher may damage the art work. 100% money back for any quality issue buy with confidence