The E37 offers a full, 4.85-inch, satin-finished, AUS8 stainless steel blade that has undergone SOG's proprietary Cryogenic Heat Treatment process, which ensures that this blade will stay sharp over the long haul. This intensive process takes more than 48 hours and requires slowly reducing the blade's temperature to less than -300 degrees Fahrenheit, then slowly heating the blade to room temperature. The stress created by this process strengthens the steel on an atomic level and increases the blade's overall durability and edge retention.