13:1 Enhanced Integrated Axis Gear Set. Due to the reinforced shaft and renewed shaft, the gears have an improved concentricity (improved central point at which different shafts come together). This ensures a better balance of the gears. Manufactured from durable steel, which means that the chance of deformation is very small. The sector gear is made of chrome molybdenum alloy steel, making this gear set suitable for high stress builds.