Pre loved and in good used condition. Worn once. Materials: 18k gold plated stainless steel (waterproof material) Measurements: 440mm/17.3" in length, 50mm/2" in extension length，3.5mm in width. Waterproof: This item is waterproof and tarnish-free, making it ideal for daily wear. You can confidently wear it while showering, swimming, or simply going about your day.