They can be made in many different shapes and sizes, and can be made from brass, bronze or cast using zinc alloy.The manufacturing process normally takes around ten days depending on the image that is be produced. 3D logos are usually cast and this process can take ten to fifteen days. Charms can be enamel with soft or hard enamel as well as the could include cloisonné. They can be engraved with text or years of service. Gemstones can also be added for extra bling.