ARRMA ARA330712 Shock Springs: 55mm 1.3N/mm (7.6lbf/in) (2) / These high-quality shock springs will allow you to tune your vehicle’s handling characteristics in seconds! Features precision manufactured spring steel for consistent performance and long-lasting durability. Technical Specifications: 55mm Length, 1.2N/mm (6.9lb/in). Includes 2 x Shock Springs: 55mm 1.2N/mm (6.9lbf/in).