11 oz. ceramic mug, dishwasher and microwave safe. Design printed on both sides of mug. Someone once asked me "what is this marshmallow character?" That person, obviously, was not from Boston. This marshmallow is my version of the gigantic, 140-foot tall natural gas storage tank in the Dorchester neighborhood of Boston. Highly visible from Interstate 93, it is a beloved local landmark thanks to Sister Corita Kent's bold streaks of color that cover the tank, commonly referred to as The Rainbow Swash. As a kid we'd drive past and I'd wave at it, now it is waving back.