High Load Capacity: Made of high-quality spring steel, Sturdy Steel Construction ensures a maximum load of 500kg/1100lbs per spring. High hardness, non-toxic and pollution-free environment. Can be used with confidence. . Durable: The hammock spring is galvanized on the hardened spring steel, which is anti-corrosion and anti-rust, improve the weather resistance and service life of the porch swing spring. . Buffer Function: The spring absorbs shock from your hammock movement to help relieve stress from impacts, provide a more comfortable, softer feel and reduce noise. Increase the lifetime of the hammock. . Simply Use: Length:10.8cm/4.25in, width: 4cm/1.57in, diameter: 7mm/0.28in, with hooks at both ends, easily connect what you need to hang without using any tools or complicated operations. .