INCLUDES - 1 pc Hammock Chair Swing Spring, 1 pc Pin Plug Hardware and 1 pc bearing. The spring and u-pin plugs are made of steel, surface treated with baking process, rust-proof, corrosion-resistant. Upgrade Kit Bearing - The BEARING is made of steel, has great wear resistance, high temperature resistance and high hardness. It can effectively increase lubrication and reduce noise. The spring can absorb the vibrations when shaking, play a buffering role, increase the life of the chair and make it more comfortable when shaking. WIDE APPLICATION - For use with almost all hanging chairs, egg chairs, porch swings, freestanding 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 guarantee. If for any reason you are not completely satisfied, you can ask for a replacement or full refund, no questions asked.