This shiny 18K yellow gold filled box chain necklace is 18 inches long and 1.2mm wide. This necklace is tarnish-resistant and hypoallergenic. It does not flake off, tarnish or discolor. *** Free Velvet Gift Pouch Included. We have 16/18/20/22/24/26/28/30/32/34/36/38 inches in stock for this model.