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 surface paint finish for rust-proof and corrosion-resistant performance. Upgrade Kit Bearing - The bearing is made of steel and offers excellent wear resistance, high temperature resistance, and high hardness. It helps increase lubrication, reduce noise, and extend the lifespan of the chair. The spring absorbs vibration during use, providing a buffering effect for improved comfort and durability. 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 supports the daily use of most households and matches the typical weight capacity of standard egg hanging chairs. EASY TO USE - Installation is simple; refer to the included image for assembly sequence. The clevis pin passes through the support and connects to the spring. Replace or install in minutes. QUALITY GUARANTEE - Each product is carefully inspected before packaging. Satisfaction guaranteed. If you are not completely satisfied for any reason, contact the seller for a replacement or full refund.