The TeraFlex-tuned JK: FOX Factory Performance Series 2.0 Smooth Body IFP Steering Stabilizer features an aircraft-grade 6061-T6 heat-treated aluminum shock body with impact cold forged body construction. The IFP (Internal Floating Piston) provides controlled turning with a responsive feel while the heat treated and hard chrome plated 5/8" diameter alloy steel shaft provides long lasting performance.