18k Gold Filled 2.5mm Ball Chain. Other Thicknesses are available in our other listings. 100% hypoallergenic, Nickel and Lead Free. Tarnish Resistant, Waterproof Material : 18K Gold filled Closure : Lobster Claw Measurement :2.5mm Thickness- other options available under different listings. Necklace Length: Options Available. - Fast Shipping - orders ship in 1-2 business days - Satisfaction Guarantee, Returns Accepted - Please ask for larger quantities if would like more than what is currently listed! - For international customers: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility.