This listing is for a set of 4 ceramic cups. They have white glaze on the inside and a copper glaze on the outside. Each one holds about 14-16oz of liquid and are microwave and dishwasher safe.
Note: There are small variations between each of them, and some have some minor pinholes that aren’t sharp, but didn’t completely smooth over. (The copper glaze is very finicky and just doesn’t like clay with any iron in it, and this clay did have some.)