Main features: Designed for scale and trail trucks. Anodized aluminum parts. CNC machined delrin shock spring adjust nut. CNC machined aluminum parts for the durability. CNC machined aluminum shock cartridge. Various hole type delrin shock pistons.(2,3,4holes) 3.5mm thick shock shafts. Dual O-Ring sealed into the shock cartridge for preventing leak of oil. RSD shock laser marked. What's included: CNC machined & black anodized aluminum shock bodies CNC machined & silver anodized aluminum shock cartridges Lower shock ends include red anodized aluminum balls. Delrin shock spring adjust nut x 2 3.5mm thick shock shaft x 2 Shock spring x 2 Bottle of shock oil x 1 All necessary hardware to finish the shocks Assembly instructions x 1 Specs: Length (mounting hole to hole): 100mm Shock body diameter: 11mm Shock spring diamenter: 15mm Shock spring length: 54mm Full shaft travel range: 31mm Shock shaft diameter: 3.5mm