Includes - 1 Hammock, Chair, Swing, Spring, 1 Part, Pin Sleeve and 1 Bearing. The spring and cap are made of steel, and the surface is painted to be rust and corrosion resistant.Bearing Upgrade Kit - The bearings are made of steel, which is very durable, high temperature resistant and high hardness, which can effectively increase lubrication and reduce noise. The spring can absorb the vibration when shaking and play a buffering role, extending the life of the chair and making it more comfortable when shaking. WIDE USAGE - Works with almost all hanging chairs, egg chairs, porch swings, freestanding swings, hammocks and hanging chairs. Safer suspension - Spring load capacity is over 500 pounds, which can meet the daily use of most families, which is consistent with the load capacity of ordinary hanging egg chairs. Easy to use - you can refer to the picture for the installation sequence, the U-shaped pin goes through the bracket and connects to the spring. You can install it or replace your existing one in minutes.