The Clay in Motion Handwarmer Mug is the unique design created by Bob and Corina Neher at their pottery studio in Milton Freewater, Oregon. Every mug is a cozy, wrap-around fit and warms your hand from the hot beverage inside. Handwarmer Mugs are made of lead-free clay, and are dishwasher and microwave safe. Left-handed. Mystic Water glaze. 14 oz.