Emulsion type Nitrogen Charged designSTX Single Tube design36 mm Piston DiameterBuilt-in Adjustable PreloadIncludes Preload Adjuster ToolHard Anodized - Precision CNC-Machined ComponentsLow-friction Shaft/Seal Head designFully Serviceable and RepairableInstalled springs are 60360-01 – Riders under 80 kg (176 lbs)Alternate springs included 60360-02 – Riders over 80 kg (176 lbs)