- Made from through-hardened, shock-resistant die steel. - Heat treated to be as hard as bearing races all the way through, giving them the ultimate in toughness and wear resistance. - Made of the same steel used to punch holes through 1" thick plates of steel on high speed punch presses - Don't settle for inferior sprockets - 12 Month guarantee! No other sprocket manufacturer will replace your sprocket if it should wear out within a year. Dirt Tricks will. No questions asked. - Great value! - Endorsed by Malcolm Smith