Made with laser cut birch wood and surgical steel posts and backings. Great for sensitive ears! Free of Nickel, Lead and Cadmium Approximately 9.5x9.5mm. Care and other info: Remove before showering, swimming, and sleeping. Due to natural differences in wood and hand painting you will see slight variations from one piece to another however this only increases their originality and sentiment. Colours may appear slightly different from one computer screen/device to another.