Knock, Knock, Knock, Penny Big Bang Theory Mug Mug by CafePress
Small measures 3.75 tall, 3 diameter; Mega measures 4.5 tall, 3.75 diameterSmall holds 11 oz.; Mega holds 20 oz.Black color-changing mugs available in small only and are heat sensitive. Simply add any hot liquid to the mug and see the mug turn from black to white with your unique design. Dishwasher and microwave safe
