Your inner mermaid called and she get treat yourself girl! This mug is sure to catch the eye of all your gorgeous mermaid friends customers. Mugs are 16oz double wall, BPA free. This design is a vinyl decal, don't worry it won't just come off with regular use. The vinyl I use is outdoor sign quality and is considered a permanent application. Not sure about vinyl products? Shoot me a message I'd love to yell you why it's the best.