The ARRMA GRANITE GROM MEGA 7075 Alloy Front/Rear Adjustable Spring Shock by GPM features precision 7075 alloy construction with sealed, oil filled damping to provide stable response across different setups. A silver spring with 1.0mm wire diameter is preinstalled, and the kit also supplies a black 0.9mm and a gold 1.1mm spring so you can fine tune ride stiffness for handling balance. Designed for front and rear installation, these components focus on durable service life and consistent tuning feedback for hobbyists upgrading their suspension.