Dirt Tricks front sprocket Yamaha YZ125/YZ250F

Dirt Tricks Front Sprocket is constructed from ultra-hard tool steel. Most front sprockets sold today are "box hardened," which means that only a thin outer layer of steel is hardened. Underneath that layer is soft steel. Our front sprockets are heat treated, giving them the ultimate toughness and wear resistance. How can we have such a hard material without it being brittle? Shock-resistant tool steel is the answer. This is the same steel used to punch holes through 1" thick steel plates on high-speed punch presses. - MADE IN THE USA! - Made from high-quality impact-resistant tool steel - Machined to the strictest industry standards - Special "through" hardening process for - ultimate toughness and long life - 13-tooth front sprocket weighs 141 grams