1. Material: 925 sterling Silver<br />2. Chain width : 1.5 mm Approx<br />3. Chain Length: 8 Sizes for Selecting 16/18/20/22/24/26/28/30inch <br />4. The Necklace Marked ""925"" on the Near of Lobster Clasp<br />5. conversion: 1inch = 25.4mm or 1mm = 0.03