Go ahead and purchase the West Star spring. It is more sturdy than other brands and provides the most relaxing rest on swing or hammock.The West Star spring is universal and can be used with all hammocks, chairs, and swings.Attaches between the hammock/swing/chair and swing chain to provide the best soft comfort for all customers.The West Star spring is 8.5″ long and 2″ wide. Built to provide our customers with the best support.You will not be disappointed with the quality of our product as it built with very sturdy steel.The weigh capacity is greater than other springs. 400lb weight capacity and is waterproof.