Enjoy up to 20-ounces of your favorite beverage in style! This officially licensed This heat sensitive Star Wars mug reveals colorful hidden lightsabers when hot liquid is added., BPA and toxin free ceramic with an easy comfortable grip handle. Hand wash only; not suitable for microwave or dishwasher. Makes a great gift for Star Wars fans! Produced by Silver Buffalo, a trendsetting housewares and home decor company based in the heart of New York City.