Mustard and Grays Enamel Mugs are as practical as they are fun. Great for backpacking, camping, fishing, or other travelling and outdoor activities, our enamel mugs have a comfortable steel rim compared to many rolled-edge alternatives. Constructed of lightweight steel and coated with durable enamel. Due to the nature of Enamel, there will be bumps and blemishes that add to the rugged aesthetic of this cup. Enamel easy-to-clean; however, the coating prevents dishwasher or microwave use - so hand wash only.