Ironman Sprockets might just be the toughest part you can install on your bike. Manufactured in the USA out of Chromoly Steel then Nickel/Chrome Plated, these sprockets are well known and highly respected worldwide. Dirt Tricks, the manufacturer is so confident in their toughness that they warranty their sprockets for one year. If you wear it out or break it, they'll replace it free of charge. No other sprocket can make that claim.