They measure 3 1/2" tall and have a diameter of 3". Stacked they are just under 6" tall. Bottoms are marked Fire King. They do have some wear which is typical of vintage items. A scrape on one mug near the bottom and handle. Please look at pictures.
Have fun with your coffee or tea. And keep organized with the stacking feature when not in use.
I gladly combine shipping whenever possible..