Note: Before purchasing, measure your original springs from hook to hook end, disconnected from the trampoline and fully compressed. Designed to provide high-quality steel with a thick gauge and multiple coils for enhanced strength, safety, and bounce performance. Trampoline springs are made from carbon steel with zinc plating to help protect against corrosion and rust caused by moisture and oxidation. Features high strength, good flexibility, uniform tension, and a smooth surface. Compatible with various sizes of trampolines, including large, medium, and small models. Specifications: Material: 70# Carbon Steel Wire Diameter: 3.0 mm Size Chart: 3.5 Inches - Overall length: 9 cm (3.54 inches); Max diameter: 7.5 cm (2.95 inches) 4.0 Inches - Overall length: 9.5–10 cm (3.74–3.94 inches); Max diameter: 7.5 cm (2.95 inches) 4.5 Inches - Overall length: 12 cm (4.72 inches); Max diameter: 7 cm (2.76 inches) 5.0 Inches - Overall length: 13.5 cm (5.31 inches); Max diameter: 7 cm (2.76 inches) 5.5 Inches - Overall length: 14.7 cm (5.79 inches); Max diameter: 7 cm (2.76 inches) 6.5 Inches - Overall length: 16.7 cm (6.57 inches); Max diameter: 7 cm (2.76 inches) Package Includes: 1 x Trampoline Spring (7-Pack) Note: Slight measurement deviations may occur due to manual measurement.