The 16oz barreled Dodsworth Ceramic mugs are manufactured with a specialized reactive glaze process that uses a multi-layering technique with two or more complementary colors which blend together during firing. These variegated glazes create a unique, one-of-a-kind effect on each individual mug and so no two are alike. As reactive glaze colors can vary drastically, these artistic ceramic mugs may not be suitable where color consistency is crucial.