Heavy Duty 1100Lbs Capacity 4Inch Spring Hammock Chair - Porch Swing, 2 Pieces Porch Swing Springs are Made of heat-treated stainless steel springs, one piece weight capacity of 500LB, Introducing a unique even suspension system can increase the elasticity of your beloved hammock chair. The Swing Springs are PREMIUM 304 Stainless Steel HEAVY DUTY Spring,will absorb the shock and preserve the longevity, Reduce noise, vibration and stress,Slight Extension Spring The Spring Hook Is Asymmetrical in design, Which Can Bear more Weight and Prevent the tilt of the Hammock Chair. The spring locates between the overhead support and swing chain to provide a more comfortable, softer feel to porch swings, free-standing swings, hammocks and hammock chairs. The 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,swimming pools backyard , cave more, Whether Indoor outdoor?Can be widely used in various occasions.