Includes: 1 Hammock Chair Swing Spring, 1 Pin Plug Hardware, and 1 bearing. The spring and U-pin plugs are made of steel with a surface paint baking process, making them rust-proof and corrosion-resistant. Upgrade Kit Bearing: The bearing is made of steel and offers great wear resistance, high-temperature resistance, and high hardness. It can effectively increase lubrication and reduce noise. The spring absorbs vibration when swinging, providing a buffering effect, increasing the chair's lifespan, and making it more comfortable. Wide Application: For use with almost all hanging chairs, egg chairs, porch swings, free-standing swings, hammocks, and hammock chairs. Safer Suspension: With a load-bearing capacity of over 500 pounds, the spring can meet the daily use of most families, which is consistent with the load-bearing capacity of ordinary egg hanging chairs. Easy Installation: You can refer to the picture for the installation sequence; the clevis pin passes through the support and connects to the spring. You can install it or replace existing ones within minutes. Quality Guarantee: Every product has been carefully checked before packaging. Satisfaction is guaranteed. For any reason you are not completely satisfied, you can request a replacement or a full refund, no questions asked.