These high-quality shock springs will allow you to tune your vehicle handling characteristics in seconds.Features:Precision manufactured spring steel for consistent performance and long-lasting durability Specification: 40mm Length 6.6N/mm (38lb/in) Other 40mm Springs in the range: #ARA330632 #ARA330633 Includes:2 x 40mm Shock Spring - 6.6N/mm (38lb/in)