Dirt Tricks Lightweight Steel Front Sprocket Yamaha verbar YK2

Dirt Tricks Lightweight Steel Front Sprocket Yamaha | YK2. The Dirt Tricks Front Sprocket is built from an ultra-hard tool steel. Most front sprockets sold today are "case hardened", meaning that only a thin outer layer of steel is hardened. Below 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- Dirt Tricks Lightweight Steel Front Sprocket Yamaha | YK2.