Duplex tooth design . 5. High positive rake with DUPLEX tooth design for maximum strength when cutting difficult material such as super alloys. 6. Specially engineered relief angle. 7. More agreesive action for easier chip formation. Specification Note Please don't forget proper break-in of band saw blades, you achieve significantly better cutting results and band life time expectancy. Set for first 20 minutes feed rate to 50% and cutting speed to 80% of normal values.Band Saws suppliers website:http://www.boyatools.com/band-saws/