【6mm Silver: Approximately 100 pieces】 Flat dish diameter: Approximately 6mm Because it is a nickel-free material, it is unlikely to cause allergies, but it cannot be used by those with sensitive skin. * Comes with clear catches -----What is Nickel-Free?------ It is a material made to minimize the content of nickel, which is known as a cause of metal allergies. It is a material that is relatively unlikely to cause allergies.