These Fox truck shocks are cold-forged, metal impacted 6061 T6 with aluminum bodies that dissipate heat three times faster than a conventional steel body shock. Fox 2.0 Adventure Series Shocks: These truck shocks have been built specifically for Zone Offroad and valved to compliment your Zone lift kit. Utilizing FOX's proven damping technology to provide a comfortable on-road ride and predictable off-road handling in a variety of conditions, they use a 2' OD steel body construction with a large 5/8″ heat treated hard chrome plated shaft for increased strength and durability. The monotube design uses an internal floating piston (IFP) to separate the shock oil from the high-pressure, nitrogen charged gas chamber. This eliminates oil aeration for fade-free performance from the vehicle specific valved shocks for in rough terrain.