A. The shape of the spring helps to reduce impact pressure, absorb shock, reduce noise, vibration and pressure, provide a more comfortable and softer feeling, extend the service life of the hammock, and provide a better experience. B. The swing spring is a galvanized high - carbon steel wire spring coil, strong and anti - corrosion. It can be used at will, is durable and not easy to rust, and is safe and stable. C. Package includes: 2 pcs heavy suspension spring. Product thickness: 7mm/0.3inch, product weight: 384g/13.5oz, tensile strength: 500kg/1102.3lb D. Application: Wide range of uses and suitable for all punching bags, hanging chairs, silkworm cocoons, egg chairs, wicker baskets, boxing sandbags, etc. E. Easy to use: Just attach to your hammock and accessories and go. You can install it or replace existing ones in minutes. Delicate and compact, convenient to carry, does not take up space.