HFR Rebound Gold Valves: Hi-Frequency Response Mid-Valve Technology Fork Caps with Compression, Rebound and Preload Adjustment (selected models) Length Adjustable (can be lengthened) Precision-machined aircraft billet aluminum Low-Friction Coatings and Surface Finishes Reactive Top-Out Spring Technology Elastomer Bottom-Out System Gold Valve Charts and extra Valving Shims Guaranteed Performance Made in USA