Trick Flow Track Max Pacaloy valve springs are made from a proprietary blend of alloys and tested under rigorous conditions to ensure that they perform at the highest level. Track Max Pacaloy racing valve springs began their existence with cutting-edge material and processing advancements. They are CNC-coiled from high tensile-strength and extra-durable Pacaloy chrome-silicon steel and are double shot-peened beyond Aerospace Material Specification reliability standards. Whether you use them in your street or race machine, Track Max Pacaloy springs from Trick Flow are built to perform and will help get the most out of your motor.