QA1's Aluma Matic non-adjustable shock gives you the best ride in rodding without having to worry about valving options. Lightweight Aluminum Body, Non-Adjustable, Coil-Over, 100% Dyno Test and Serialized, Revalveable and Rebuildable by the QA1 Factory or QA1 Authorized Service Centers, American Made, Precision Machined Aluminu m Piston with PTFE Piston Band, 15mm Centerless Ground, Hard Chrome Plated, Solid Piston Rod, Three Step Sealing System.