Fox Performance series shocks are designed with a precision metal impact aluminum body which was implemented to cool the shock and maintain a rust-free shock body. Fox is known for their (IFP) Technology, which stands for Internal Floating Piston. The IFP does a great job eliminating oil aeration, allowing maximum performance from the factory tuned precision valving. Combining both the high flow piston along with the precision valving of the Fox Performance shocks, these shocks can handle the roughest of road conditions.