The metering piston is CNC machined from 7075-T6 aluminum to provide the best service life for high-speed applications. Sway-A-Way’s mid-speed compression adjusters are an excellent solution for any application that varies weight often, or that might be used in a variety of terrains where a quick adjustment is desired for optimizing the comfort level of your ride. These rear coilovers are 100% designed and built in the USA, and feature high strength steel cylinders that are coated with a two-step zinc plated finish designed and salt spray tested to withstand the harshest of environments. A red anodized finish on all external CNC machined aluminum components will protect against the elements for years to come. The multi-seal carrier includes redundant seals to keep even the smallest dirt and debris out and keep the specifically formulated 7wt fully synthetic shock oil in. Viton O-rings ensure a leak free seal at the most extreme temperatures. Sway-A-Way shocks are easily rebuildable and revalveable by a trained professional. All seal kits, spare parts, and valve shims are available through aFeControl.com. All direct fit Sway-A-Way shocks come with a warranty that protects them against manufacturer defects.