When she sips her morning coffee out of our customized sisters mug, she'll be reminded how much you love and appreciate her. This is the perfect personalized gift to give your sister for her birthday or any other occasion that honors her. Our Personalized Sister Mug is dishwasher safe & includes free personalization. We will personalize your mug choice with up to 6 names. Mugs are available in different sizes ranging from 11 ounces to 20 ounces.