Sturdy steel construction. Galvanized and clear coated for added weather resistance. Very strong and can be used for a long time. The spring helps relieve the stress of impact, provides a more comfortable and softer feel, and increases the life of your hammock as well as the hammock surface. Assembly. Compatible with almost all punching bags, punching bags, hanging chairs, cocoons, egg chairs, wicker chairs, etc. Rated spring capacity of more than 700 pounds. Contents: 2 x Carabiners. Wire diameter: 7mm/0.3 inch (approx.), Length: 108mm/4.25 inch (approx.). Product Description 2 Pcs Heavy Duty Extension Carabiner Hanging Hooks Swing Accessories Fishing Spring Bag for Hanging Hammock and Swing Chair. Sturdy steel construction. Galvanized and transparent coating for greater resistance to weathering. The spring helps to relieve the stress of impact, provides a more comfortable and softer feel, and in addition to the mounting surface, extends the life of your hammock. Rated spring