Description: Note: Prior to purchasing, measure your original springs from hook end to hook end, disconnected from your trampoline, and completely compressed. Designed to offer the best quality steel, the thickest steel gauge, and the most coils to provide the safest, strongest, and bounciest springs. Stainless steel material trampoline springs feature a zinc plating to protect against corrosion and rust caused by natural acids, moisture, and oxidation. High strength, good flexibility, uniform force, smooth surface. Suitable for all kinds of large, medium and small trampolines. Specification: Material: 70# Carbon Steel Wire Diameter: 3.0 Size Chart: 3.5 Inches - Overall length: 9cm/3.54inch; Max diameter: 7.5cm/2.95inch 4.0 Inches - Overall length: 9.5-10cm/3.74-3.94inch; Max diameter: 7.5cm/2.95inch 4.5 Inches - Overall length: 12cm/4.72inch; Max diameter: 7cm/2.76inch 5.0 Inches - Overall length: 13.5cm/5.31inch; Max diameter: 7cm/2.76inch 5.5 Inches - Overall length: 14.7cm/5.79inch; Max diameter: 7cm/2.76inch 6.5 Inches - Overall length: 16.7cm/6.57inch; Max diameter: 7cm/2.76inch Package Includes: 1 x Trampoline Spring(7 Pack) Note: Please allow slightly measuring deviation due to manual measurement.