Woodland Friends Colour Changing Mug SetWatch as the dark colors of the forest trees fade away when hot liquid is added to reveal the bright colors of the hidden forest creatures. The perfect gift for children & families to share with siblings or friends. Just add hot liquid inside the mug and watch the outer design change color and reveal fun designs, characters and colors. Each gift box features 2 kid sized mugs with slightly different designs while sharing the same theme. 70 g (2. 4 oz)