These are Boo and King Boo shot glasses inspired from the Super Mario Bros. series. It's somewhat of a throw back but who doesn't like some classic NES action? These are clear glass shot glasses etched on one side. They each can hold 1.5 oz and are very sturdy and built to last. All of these items are handmade, therefore, there might be slight differences from one item to the next. That being said, the quality of the product will not be hindered. Each shot glass in essence is unique.