STURDY MATERIAL - The porch swing springs heavy duty are made of premium steel material, with a galvanized surface, and high hardness. The springs are tightly coiled to absorb shocks and avoid vibrations. They are not easy to rust and deform, which can be used for a long time. EASY TO INSTALL - These heavy-duty swing springs are easy to install. Simply connect your hammock and accessories, and be able to install or replace it in a matter of minutes, no additional are tools required. The swing hanger rotates freely 360 degrees, making it easy to clean. SECURE DESIGN - The 4 pack porch swing springs have plastic caps on both ends, which can keep your fingers or hanging rope in good contact and also keep the spring from falling off the hook. A unique even suspension system can be introduced to increase the elasticity of the hammock. PACKAGE INCLUDES - You will receive 1 springs for the hanging porch swing, measuring 8.5 x 1.74 inches in size and strong enough to meet your usage needs. BROAD APPLICABILITY - This hammock chair spring can be applied for hanging chairs, hammocks, sandbags, swing chairs, sling trainers, awnings, yoga, and much more. They can be used on patios, porches, trees, ceilings, backyards, caves, and many other indoor and outdoor settings.