Boss shocks are the only shock on the market to offer KNK’s Proprietary Fully Machined Delrin Piston with an O-Ring that has zero blow by. Yes, it works like a REAL shock! Shock bodies, caps and lower spring cup are all machined aluminum. Lower spring retainers can be removed simply by taking out one screw. As you can see the shock bodies are fully threaded to accept our newly designed Adjustable Offset Mounts (Sold Separately). These mounts allow you to adjust your ride height without ever changing your spring rate or shock location. Springs will be available in (4) different spring rates to allow you to tune that rig for your own driving style.