1. Material:Porch swing springs is made of high-quality chrome-plated 304 stainless steel. porch swing springs surface has a waterproof and transparent coating, high hardness, heavy duty springs no rust, no corrosion, recyclable, no pollution to the environment, spring for swing environmental protection and sanitation, strong and tough, and longer life 2. Multifunctional Use:Porch Swing Springs Hammock Hanging Kit Safe for Hammock Chairs or Ceiling Mount Porch Swings,Yoga, porch swing, hammock, sandbag, hanging chair, lamp, sling trainer, awning, sling trainer, chair, backyard and swimming pools, cave and more, Whether Indoor and outdoor, 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 hammock spring weight capacity of 650lbs,porch swing chain kit Introducing a unique even suspension system can increase the elasticity of your beloved hammock without being too stiff or too weak 4. Package Include:Hanging Chair Spring Hammock Hanging Kit contains 2 pcs springs 304 stainless steel Springs. Each end of the swing spring has a rubber tip preventing you from scratching your fingers or hands When you install the heavy duty springs