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 and reduce noise. The spring absorbs vibration during use, providing a buffering effect that enhances comfort and extends the chair's service life. WIDE APPLICATION - Compatible with most hanging chairs, egg chairs, porch swings, free-standing swings, hammocks, and hammock chairs. The spring supports the typical load requirements of standard egg hanging chairs for everyday household use. 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. The kit can be installed or used as a replacement in minutes.