AR-SFII utilizes the same process as AR-RPM9, a proprietary spray form method that produces an exceptionally fine grain structure that gives the steel additional toughness when compared to other steels with similar formulas and improved sharpenability. These factors have been key to the success of AR-RPM9 over the last 4 years. Over the development of AR-SFII, our goal has been to maintain the exceptional toughness of AR-RPM9 while enhancing the edge retention properties of the new steel. The formula listed below is the result, and we are confident that it will perform admirably against any other steel in a similar price range!