The prince's wan (also known as a penis plug) is a particularly unusual piece of body piercing jewelry. It consists of a hollow tube with a threaded cap at the end. The tube is inserted into the urethra, and a stem is inserted through a Prince Albert piercing and into another threaded hole on the side of the tube. The general shape is similar to a police nightstick. The little side stem holds the tube in place. The threaded cap, often just a ball, can be removed so the wearer can urinate through the hollow tube without having to remove the jewelry (from the Prince Albert piercing).