①. Includes 1 piece of Hammock Chair Swing Spring, 1 piece of Pin Plug Hardware, and 1 piece of bearing. The spring and u-pin plugs are made of steel with a surface paint baking process, featuring rust-proof and corrosion-resistant properties. ②. Upgrade Kit Bearing - The bearing is made of steel, offering wear-resistant, high temperature resistant, and high hardness characteristics. It can effectively enhance lubrication and reduce noise. ③. The spring can absorb vibration during shaking,起到缓冲作用，延长椅子使用寿命，并在摇晃时提供更舒适的体验。 ④. Wide Application - Suitable for use with almost all hanging chairs, egg chairs, porch swings, free-standing swings, hammocks, and hammock chairs. ⑤. Safer Suspension - With a load-bearing capacity of more than 500 pounds, the spring can meet the daily use needs of most families, which is consistent with the load-bearing capacity of ordinary egg hanging chairs. ⑥. Easy to Use - You can refer to the picture for the installation sequence: the clevis pin passes through the support and connects to the spring. You can install it or replace the existing ones within minutes. ⑦. Quality Guarantee - Every piece of product has been carefully checked before packaging. Satisfaction is aimed for. For any reason you're not completely satisfied, you can ask for a replacement or full refund without questions.