10cm (4 in) tall, 8.5cm (3 3/8 in) diameter.
I bought it from a charity shop and improved it. It’s a bit like the way I draw on photographs, except I drew on a mug instead.
I drew on the mug with porcelain pens, so the added markings are dishwasher safe. This mug *seems* to be dishwasher safe, but I don’t know how to tell for sure.