The 16 Series shock is a threaded large body shock that is built to last at an affordable price. Adjust your gas pressure on-the-fly with the Schrader valve to help adapt to changing track conditions. Featuring a hard anodized 6061 aluminum threaded body that provides excellent corrosion resistance and superior hardness, this shock is designed to be a top performer for years. The 16 Series is a great shock for late models. Works best on rough, heavy and average dirt race tracks as well as bumpy asphalt tracks. Made with a 2" O.D. hard anodized aluminum threaded monotube body and featuring linear or digressive valving, a Schrader valve to easily adjust your gas pressure on the fly and deflective disc valving for non-fading performance. Linear valving provides a more stable car and allows the driver to feel the car better. Linear digressive valving is an excellent choice when maximum rebound force is needed for big, low speed, tie-down applications. These shocks are racer rebuildable and revalveable with custom valving available. All 16 Series shocks are 100% dyno tested in QA1's Lakeville, Minnesota facility.