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 with a baked paint surface finish, providing rust-proof and corrosion-resistant properties. Upgrade Kit Bearing - The bearing is made of steel and offers excellent wear resistance, high temperature resistance, and high hardness. It helps improve lubrication, reduce noise, and extend service life. The spring absorbs vibration during use, providing a buffering effect that enhances comfort and increases the durability of the chair. WIDE APPLICATION - Compatible with most hanging chairs, egg chairs, porch swings, free-standing swings, hammocks, and hammock chairs. SAFER SUSPENSION - With a load capacity exceeding 500 pounds, the spring meets the daily usage requirements of most households and matches the standard weight capacity of typical egg hanging chairs. EASY TO USE - Installation is simple; refer to the included image for the correct sequence. The clevis pin passes through the support and connects to the spring. Can be installed or replaced within minutes. QUALITY GUARANTEE - Each product is thoroughly inspected before packaging. Satisfaction guaranteed. If you are not completely satisfied for any reason, a replacement or full refund is available.