Mermaid Metal Alloy Nail Art Deco Nail Charms. They are 1 cm x .5 cm. The pieces are available in gold or silver. They are reusable and can be applied to natural or polished nails. These charms can also be used to dress up other objects like: key chains, jewelry, zippers, and other items. They are very easy to apply and can be done by a nail tech or even yourself. This is a great way to make yourself have a unique look all your own.