ACDelco Professional Premium Gas-Charged Struts offer the superior ride of a Premium Gas-Charged Strut with patented RoadResponse technology. Custom-tuned gas charge for optimized vehicle performance, and also feature a hardened, chromed piston rod that provides an ultra-smooth corrosion- and scratch-resistant surface, increasing seal life. Product Features:RoadResponse Technology:Helps respond to changing road conditions with motion-sensitive valving.Provides a more comfortable ride during normal driving conditions.O-Ring Piston Seal that does not allow oil blow-by, providing improved resistance and control.Custom tuned gas charge optimizes vehicle comfort and performance.Electrostatic paint allows for excellent coverage and better corrosion resistance in hostile environments.Drawn Over Mandrel tubing reduces component wear internally for longer durability.Hardened chromed Piston Rod provides superb corrosion resistance and product life.Piston Rod Seal is permanently lubricated for greater durability.Validated to meet fit and function specifications.