Features & details: - Trampolines Springs: Includes (16) Replacement/Spare Spring - Designed for Use with SereneLife Trampolines - These springs are designed with an advanced tension mechanism - Heavy-duty galvanized steel springs - Weather resistant and anti-rust - Used for connecting frame tubes and triangle hooks around the jumping mat - Works great with SereneLife Trampoline Models: SLTRA10BL, SLTRA10PNK, SLTRA12B, SLTRA8BL Technical Specifications: - Product Dimension: 5.25 inch (Length), 0.875 (Wire Diameter)