Material:Made by high quality Stainless Steel. Sturdy Steel Construction, ood performance, orrosion-resistant, durable and safe. Safe and firm:It attaches securely to your rocking chair so you can turn and rotate without getting tangled or turning. Quiet, stress and vibration. Relieve Collision:The spring helps relieve stress from impacts, provide a more comfortable, softer feel and will increase the lifespan of your hammock, in addition your mounting surface. The suspension spring ring is made of high-quality steel construction.They can support weight up to 250 kg. Count on these high quality swing hangers to support children and adults safely and securely. The hammock springs absorbs shock from your hammock movement to help relieve impact or vibration that provides a comfortable use.Our hammock spring can fit almost all punch Bag,Hanging Chairs,Cocoon,Egg Chair,ratton wicker basket,hanging lamp,sling trainer,sandbag,aerial gym. SPEZIFIKATIONEN: Material:Stainless steel. Color: Silver. Length: 108mm/4.25"" (Approx.) Package Includes:2 Piece Suspension Hooks. WARM NOTE: 1.There may be slight chromatic aberration from pictures 2. Manual measurement, please allow slight error and double check the size before purchasing.