Significantly increased riding comfort and adjustability Alloyed steel main shock body with black finish Springs manufactured from Cr-Si alloyed steel (black) Black anodized CNC machined billet aluminium head Manual spring preload adjustment system (tool included) Nitrogen pressurized coaxial chamber with oil/gas aluminum piston Includes set-up manual, install instructions, and adjustment tool Adjustable features include: Spring preload (manual) Hydraulic rebound Heavy duty springs available, please request at checkout