INCLUDES- 1 pcs Hammock Chair Swing Spring 1 pcs Pin Plug Hardware and 1 pcs bearing.The spring and u-pin plugs are made of steel, surface paint baking process made, rust-proof, corrosion-resistant.Upgrade Kit Bearing - BEARING made of Steel, have great wear-resistant, high temperature resistance and high hardness It can effectively increase lubrication and reduce nois.Spring can absorb the vibration when shaking, play a buffering role, increase the chair service life, and make it more comfortable when shaking.WIDE APPLICATION-For Use With Almost All Hanging Chair,egg chair,porch swings, free-standing swings, hammocks and hammock chairs.the spring can meet the daily use of most families, which is consistent with the load-bearing of ordinary egg hanging chairs.EASY TO USE-You can refer to the picture for the installation sequence,clevis pin passes through the support and connects to the spring.You can install it or replace the existing ones with in minutes.