These mugs were made using our Salt Kiln, a kiln that uses a salting process during peak temperatures. This gives an unique, naturally forming glaze on the exterior of the mug. The inside has been glazed with a food safe glaze and to give one of two color options. Each piece is hand thrown and unique, so slight variations or differences may occur. These mugs are 5” tall with a 3” rim and are dishwasher safe.