Precision-engineered for the ultimate in safety and performance, Ultra spring seats by Gabriel provide improved comfort and control, long life and durability, and maximum shock performance for today's passenger cars. Ultra spring seats are equipped with G-Force technology featuring Infinitely Variable Damping for on-demand control on all road conditions. And like all Gabriel shocks and struts, Ultra spring seats feature a super-finished chromed piston rod for superior corrosion resistance and a leak-proof piston seal which extends product life.