♥ Trampoline spring length: 216mm/8.5 inch ♥ Coil diameter: 3.2 millimeters ♥ Product has 51 circles, with an outer diameter of 26mm and a weight of 195g. Please refer to the product size picture ♥ Material: High quality galvanized, rust proof, trampoline springs are more sturdy and durable ♥ Trampoline spring length: 216mm/8.5 inch ♥ Coil diameter: 3.2 millimeters ♥ Product has 51 circles, with an outer diameter of 26mm and a weight of 195g. Please refer to the product size picture ♥ Material: High quality galvanized, rust proof, trampoline springs are more sturdy and durable