Made of high-quality iron, galvanized for better weather resistance. Very sturdy and can be used for a long time. The springs help relieve stress from impacts, providing a more comfortable and softer feel and extending the life of the hammock and mounting surface. Suitable for almost all sandbags, punching bags, hanging chairs, cocoon chairs, egg chairs, wicker chairs, etc. Package includes: 2 x carabiners. Wire diameter: 6.5 mm (approx.), length: 107 mm (approx.).