9 mm signet 2.5 mm band Available in sizes 6, 7, 8 Material Hypoallergenic. Water resistant. Rust-resistant. Sustainable. Gold: 14k-plated stainless steel. Silver: polished stainless steel. Signature mc engraving for authenticity. Care All Marrin Costello collection jewelry is crafted of a hypoallergenic + water resistant + sustainable stainless steel base. When not worn, please store in a protected place and use a cleaning cloth to spot treat as needed.