ACDelco Professional Premium Gas Charged Struts are custom-tuned and nitrogen gas charged with a quality twin-tube passive design to optimize vehicle comfort and performance. Featuring RoadResponse Valving Technology, ACDelco Professional Premium Gas Charged Struts automatically adjust to provide comfort and extra control by responding to dynamic driving situations during normal road conditions, and improving handling under extreme road conditions. For additional performance and safety features, ACDelco Professional Premium Gas Charged Struts have sintered iron pistons, a leak-proof piston seal, and a super-finished chromed piston rod. These struts have been carefully tested to ensure proper performance and fit per necessary applications. 1-3/8 inch bore piston with sintered iron construction for durability and longer service life Single lip oil seal for minimized friction Super-finished chromed piston rod reduces corrosion, ensures proper seal lubrication, provides a consistent wear surface, and assists in longer product life Precision engineered for top-of-the-line performance Drawn over mandrel (DOM) pressure cylinder for high quality sealing properties and reduced internal friction to assist with longer product life UPC 707773596524 Brand Name ACDelco Style Name Modern Unit Count 1.0 Count Manufacturer ACDelco Model Number 503-640 Material Type Iron Exterior Finish Black Auto Part Position Front Manufacturer Part Number 19241345 OEM Equivalent Part Number 19241345 Compatible with Vehicle Type Car Manufacturer Warranty Description Limited Lifetime Warranty (Parts Only). Please see ACDelco.com for more details. Global Trade Identification Number 00707773596524