INCLUDED - 1pc Hammock Chair Swing Spring, 1pc Pin Prop Hardware and 1pc Bearing. The spring and u-pin are made of steel, the surface is painted 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 swinging, play a buffer role, increase the life of the chair and make it more comfortable when swinging. WIDE APPLICATION - Compatible for use with almost all hanging chairs, egg chairs, porch swings, freestanding swings, hammocks and hammock chairs. SAFER SUSPENSION - With a load capacity of over 500 pounds, the spring can meet the daily use for most families, which is consistent with the load capacity of common egg hanging chairs. EASY TO USE - You can see the picture for the installation sequence, the fork pin goes 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 request a replacement or full refund, no questions asked.