Specifications:These trampoline springs are made of premium grade carbonsteel, they are sturdy, durable and can bear heavy weight.It can provide with good elasticity, uniformand firmforce.These products features hook end that allows for easy installation.The spring is designed to fit all kinds of large, medium and small trampoline.Type: Trampoline SpringMaterial: CarbonSteelQuantity: 10Pcs/SetColor: Random ColorFeatures: Wide Use, Easy to Install, Sturdy, DurableDiameter: 2.3cm/0.90" (Approx.)Wire Diameter: 3mm/0.11" (Approx.)Length(Optional): 9cm/3.54", 12cm/4.72", 13.5cm/5.31", 14.7cm/5.78",16.5cm/6.49" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:10 x Trampoline Springs