The tiny yet tough steering blocks are molded from a special composite mixture for maximum strength. Perfect for high-traction conditions. Generates less on-power steering, easier to drive.Composite steering block inserts allow for very quick & easy lower roll center adjustment. Roll center is easily achieved with additional shims and extra inserts.For maximum drivetrain reliability, larger 5x12 ball-bearings with increased dynamic load are used in the outer position. On the inner position, smaller 5x10 ball-bearings are used for minimized unsprung weight. Available in different hardness compounds.