The Traxxas 8445X Spring is specifically designed for the rear suspension of the UDR model, measuring 139mm in length and featuring a silver color. It is compatible with Traxxas vehicles, specifically cars, trucks, and motorcycles at a 1:8 scale. Manufactured by Traxxas in Taiwan, this spring is an essential component for maintaining proper suspension and steering performance on electric fuel-type vehicles. The durable and high-quality construction of this spring ensures optimal performance and reliability for RC enthusiasts.