Heat Activated Color Changing Mug. "My (Favorite) Child Gave Me This Mug" text design. Color & message on mug changes when hot liquid is poured inside (see photos for example). GR8AM brand. 12 oz size, ceramic material. Black, white & gray colors. Brand new in box. Suitable for both hot & cold drinks. Perfect for any coffee or tea lover! Great Christmas or Birthday gift idea!