This traditional 18K Rose Gold Filled Flat snake chain necklace is 18 inches long and fastens with a lobster clasp. The chain is approximately 5 mm wide. This chain is hypoallergenic, nickel-Free and cadmium-Free. 100% Satisfaction Guarantee! Quick Shipping from California. *** Free Velvet Gift Pouch Included. We have 16/18/20/22/24 inches in stock for this model.