Aldan American Regulator Series Single Adjustable Coil-Over Shocks are manufactured from aircraft grade 6061 T6 billet aluminum that is precision CNC machined then each component is hard anodized with a midnight jet black finish for a show stopping yet extremely durable appearance. The low profile adjustment knob provides 11 positions of adjustment, giving you the ability to control the rebound rate (the speed at which the shock returns to ride height after being compressed) of your shocks. They are available in multiple lengths and with poly bushing or spherical bearing mounting hardware. The Regulator Series shocks also accept industry standard 2.5" inside diameter coil springs that Aldan offers in a wide selection of sizes with gloss black powder coat or show quality chrome finishes.