THIS MUG IS HAND DIPPED AND THEN FIRED IN AN OXIDATION KILN. MUG FEATURES A UNIQUE SQUARE-LIKE AND A BLACK STAIN INTERIOR. VARYING LEVELS OF OXYGEN SHOT INTO THE GLAZE CREATES A UNIQUE VARIATION OF COLOR ON EVERY MUG. DUE TO THE INDIVIDUAL CRAFTSMANSHIP OF THESE MUGS, VARIANCES DO OCCUR IN THE COLOR PORTIONS OF THE GLAZE & MAY RESULT IN DISSIMILARITIES IN CERAMICS. DEEP ETCHED SELECTIONS AVAILABLE; PLEASE CALL FOR DETAILS. 4.438" H