A color changing mug,an awesome gift to kids,friends. -Just plain black in color when it's cold -Mug turn white except handle and custom theme image or -words appear on both sides when you pour hot liquid into it,like coffee milk or tea. -100% Ceramic.Come in 11 Ounce with black handle. -Size:3.74 "tall by 3.23" diameter. You can also customize the mugs with your creative idea. Just contact us, we will respond you within 24 hours.