CNC-machined from 1045 billet steel that withstands the high-RPM demands of competition use, these all-new flywheels from Hays are ideal for today's high-horsepower street, off-road, and race engines. Each one is CAD-designed for maximum performance and durability, SFI-certified to meet spec 1.1, and available in 157- and 164-tooth designs in both external and zero (neutral) balanced applications. Multiple flywheel weights are also available.