The 5/8" alloy steel shock shaft adds strength and toughness, ensuring top of the line performance out of these shocks. The shafts are hard chrome plated and heat-treated to resist pitting and scratches that can damage shaft seals. An Internal Floating Piston (IFP) separates the shock oil from the high-pressure nitrogen charged gas chamber to eliminate aeration, allowing maximum performance from the factory-tuned precision valving. Fox 2.0 Adventure Series shocks, where will your adventure take you?