INCLUDES - 1 pc Hanging Chair Swing Spring, 1 pc Pin Plug Hardware, and 1 pc bearing. The spring and U-pin plugs are made of steel with a surface coating process, making them rustproof and corrosion-resistant. Upgrade Kit Bearing: The BEARING is made of steel, has excellent wear resistance, high-temperature resistance, and high hardness. It can effectively increase lubrication and reduce noise. The spring can absorb vibrations when shaking, play a buffering role, increase the chair's lifespan, and make it more comfortable when shaking. WIDE APPLICATION - For use with almost all hanging chairs, egg chairs, porch swings, freestanding swings, hammocks, and hanging chair seats. SAFER HANGING - With a load capacity of over 500 pounds, the spring can meet the daily use of most families, which is compatible with the load capacity of ordinary egg hanging chairs. EASY TO USE - 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 the existing ones in minutes. QUALITY GUARANTEE - Each product piece has been carefully checked before packaging. Satisfaction Guarantee. For any reason, you are not completely satisfied, you can request a replacement or full refund, no questions asked.