1. The Hammock Swing SpringS uses a unique even suspension system with a single load capacity of 700LBS made from heat-treated stainless steel springs to give your favourite hammock chair extra resilience. 2. The Swing Springs are made of high quality 304 stainless steel heavy-duty springs, which can vibrate and stress and reduce noise, slight stretching springs to absorb shocks and maintain the life of. 3. The Springs galvanized on hardened steel, with a surface electroplated for durability and corrosion resistance, enhancing the weather resistance and life of the porch swing spring kit. 4. The Hammock Chair Spring is located between the overhead support and the swing chain, which can absorb the vibration and impact of the hanging basket during operation, providing shock absorption and noise reduction, providing a more comfortable and soft feeling for independent swings, porch swings, hammocks, and hammock chairs.