Slingshot Racing Yamaha FZ-07 FZ07 FZ7 CNC Billet Preload Front Fork Spring Adjuster Adjustor Kit Comes with (2) Preload Adjusters (reuses the stock O-ring) / Improves handling and allows for quick adjustments Made of Heat Treated (Billet) Aluminum [6061-T6] /Manufactured using 100% CNC Machining No Casting or Molding are involved in the Manufacturing Process /Finished with Anodize Coating Turn the stock non-adjustable preload forks to adjustable preload forks /Fine tune the front suspension of your motorcycle Initial Preload Adjustment begins at 7.5mm past stock / Maximum Preload Adjustment finishes at 21mm past stock