All SuperSprings are manufactured in the U.S.A.
SuperSprings Leaf Helper Spring - SSA5. from SAE5160H high grade, shot peened steel.|GMC Silverado|Sierra 1500, Mazda B-Series, RAM 1500;Maintenance-free;Self-adjusting suspension stabilizing system;475 (lb) additional load-leveling ability;Reduces body roll up to 30% without compromising ride quality;Adjustable shackles allow installation to suit various needs;Typical installation completed in approximately one hour;SAE 5160H high-grade steel construction;Shot peened to relieve spring stress and extend product life;Never load any vehicle beyond the manufacturer's GVWR;California Residents: WARNING SuperSprings provide users extra load support and reduce body roll without compromising ride quality.