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 improve lubrication and reduce noise. FUNCTION: The spring absorbs vibration during use, providing a buffering effect that enhances comfort and extends the lifespan 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 supports the daily use of most households and matches the typical weight capacity of standard egg hanging chairs. EASY TO INSTALL: Refer to the included image for installation sequence. The clevis pin passes through the support and connects to the spring. Installation or replacement can be completed within minutes. QUALITY GUARANTEE: Each product is carefully inspected before packaging. Satisfaction guaranteed. If you are not completely satisfied for any reason, you may request a replacement or full refund.