These stoneware pieces are original designs by Mara. Each piece is engraved and painted by hand. All of Mara's design pieces are high temperature fired with lead free glazes. These beautiful pieces of functional art are microwaveable and dishwasher safe, plus holds 12 oz. Approximate dimensions: 4.25-Inches x 3-inches x 4.5-Inches. This is an original design 12oz square-bottom mug that is exquisitely hand crafted in durable, world famous Mara fine art stoneware.