Lgu Sterling Silver Three Dimensional Manatee Sea Cow Necklace High Polished Chain with Oxidized Charm Height 8 millimeters (0.32 inch) x Width 21 millimeters (0.83 inch) Charm Weighs Approximately 4.0 grams. (6.1 grams including 20" necklace) Chain Thickness 0.7 millimeters (1/32 inches) Spring Clasp on Necklace