1.Material: The porch swing spring is made of high-quality chrome-plated 304 stainless steel. The surface of the porch swing spring has a waterproof transparent coating, high hardness, heavy-duty springs are rust-free, non-corrosive, recyclable, and do not pollute the environment. The springs for swings are environmentally friendly and hygienic, sturdy and durable, and have a longer service life. 2.Versatile use: The porch swing spring hammock hanging kit can be safely used for hammock chairs or ceiling mounted porch swings, yoga, porch swings, hammocks, sandbags, hanging chairs, lights, sling trainers, awnings, sling trainers, chairs, backyards and swimming pools, caves, etc. Whether indoors or outdoors, the springs can be widely used in various occasions. 3.Unique design: Our porch swing springs are made of heat-treated stainless steel springs, one piece of hammock springs bears 650 pounds, and the porch swing chain kit introduces a unique uniform suspension system that can increase the elasticity of your beloved hammock without being too hard or too weak. 4.Contains 2 springs 304 stainless steel springs. Each end of the swing spring has a rubber head to prevent you from scratching your fingers or hands when installing heavy springs