moose offroad hardparts front sproget yamaha 13t d26 4165 13crmo 11Machined from High Tensile Strength, Impact and Wear Resistant Chromoly Steel to Minimize Deformation, Inner SPLINES ARE Broached to Project Maximum Spline To Countershaft Contact to Distribute Driveline Forces Over the Largest Possible Surface Area For Corrosion Resistance and Lubricity, Each Sprocket Is Quality Checked by Computer Measurement Machine (CMM) to Exactly Match and Design Specifications, Fitments Available for Two Wheel Dirt, Adv, and