These amazing mugs are hand thrown here in Albuquerque NM, by Hands on Clay Pottery. They hold apx. 8 oz. of beverage, they're also dishwasher and microwave safe! 
 
A few details:
100% lead free and safe fired at 2,232 degrees.
Dimensions: 3" diameter x 3.5" tall
Product Care: Microwave and dishwasher safe, not gravity safe. :)