INCLUDES - 1 pc Hammock Chair Spring, 1 pc Clevis Pin Hardware, and 1 pc Bearing. The spring and clevis pins are made of steel, surface-treated with baking paint, rust-proof, and corrosion-resistant. Upgrade Kit Bearing - The BEARING is made of steel, offering great 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 rocking. 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 capacity of more than 500 pounds, the spring can meet the daily use of most families, which is consistent with the load-bearing capacity of common 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 has been carefully checked before packaging. Satisfaction guaranteed. If for any reason you are not completely satisfied, you can request a replacement or a full refund, no questions asked.