PREMIUM MATERIAL: These swing springs are made of high quality, heat treated, zinc plated steel. You can use them indoors and outdoors, on your patio, porch, tree, and ceiling. Various Applications: These heavy-duty suspension springs are tightly coiled to absorb shock. You can use them for swings, hanging chairs, hammocks, hammock chairs and punching bags, you can also use them for industrial applications where it is necessary to reduce vibration and prevent shock.< br> PLUG AND PLAY: Simply connect to your hammock and accessories and go. You can install it or replace existing ones in minutes. WEIGHT CAPACITY: We offer two types of springs with a weight capacity of 600 lbs and 750 lbs. Longer version and compact version, you can also choose ONE or TWO pieces according to your applications. Safety: A plastic cap covers the end of the wire to prevent scratching your fingers or hanging the strings, it also prevents the springs from falling off the hooks. Premium heavy-duty wire ensures