: The spring and carabiner of the hammock are made of high quality iron material, the 360 swivel hook is made of high quality stainless steel, resistant to corrosion, rust, durable. to : With the high-quality stainless steel spring you can hang the hammock and the chair very easily and safely, and with the carabiners, any stand and ceiling stand can beused. : Suspension spring set allows you to swing smoothly and comfortably, the steel spring can swing or swing with amplitude and swing absorption comfortablyoptimal shock, relax the human body. : Spring Hanging Kits with Carabiner Suitable for Porch Swings, Lights, Hanging Chairs, Canopies, Punching Bags, Rocking Chairs, Aerial Yoga, Outdoor Swings, etc.