This 12 oz vintage reproduction enamel mug is made from a thick enamel-coated steel. They are heavy (for enamel mugs-- still lighter than ceramic) and super sturdy. Seriously, drop it...I know I have.
MICROWAVE + DISHWASHER USE
There is STEEL under that enamel coating, so DON'T stick it in the microwave. I know it might be tempting to make a mug brownie in these adorable mugs, but just don't. Unless you wanted a lightening storm in your kitchen.
They are dishwasher safe and won't fade. But be aware that any spots where the enamel might eventually chip will the steel underneath to rust.