Magic mug, heat sensitive - The magic mug is black on the outside, but image will be revealed when added hot water into the mug, very magical. It will reveal Circle Game when hot water is added. Perfect for any occasions as gifts Our range of fun Various design mugs will bring a unique touch to your home or work place. Made from high quality 11oz Ceramic Printed one sided Dimensions - 325 ml: 9.7 cm tall x 8.1 cm diameter Strong, durable ceramic construction Black surface finish then when added with hot water image will reveal with a background white mug Micro-wave