Renthal Front Countershaft Sprockets are carefully crafted in their state-of-the-art manufacturing facility using core refined 655M13 Nickel-Chrome-Molybdenum alloy steel for the ultimate combination of strength and hardness. Using advanced computer engineering alongside CNC machining, Renthal consistently achieves perfect concentricity, fitment, load dispersion and uncompromising strength whilst ensuring maximum power delivery from each and every motocross front sprocket they produce. The case hardening process ensures that the front chainwheel has the longest service life possible. each chainwheel is introduced to great heat that hardens the surface. As a safety critical external drive component, Renthal prides itself on creating the number one choice of motocross front sprockets as used by the world's premier athletes and race teams. Features self-cleaning mud grooves between every tooth on both sides help prevent dirt build up.