Each piece is handmade, wheel thrown using a porcelain clay body, and screenprinted by hand with prints and patterns designed by me. This mug is printed with a navy blue "extra salty" butter label hand drawn by me. Glazed in a transparent glossy butter yellow glaze on the outside and a matte navy blue on the inside. Three sizes are available: Small (approx. 3.25" tall & holds 10-12 oz.), Medium (approx. 4" tall, holds 14-16 oz.) Microwave & dishwasher safe :) p.s. due to the nature of handmade ceramics and issues in the ceramic supply chain, there may be slight variations in size, color and glaze consistency.