Our severe duty output shafts are recommended for Xtreme uses. Perfect for hi horsepower applications such as nitrous, superchargers, drag radials/slicks and etc. Made from premium aircraft material alloy 300M (Chronium Nickel Molybdenum). This is the same material used to manufacture drive shafts for top fuel dragsters. Heat treated to a hardness of 48 to 50RC, making them practically indestructible! Rated 400hp-1300hp capable.