Created at Spyderco’s request, CTS-BD1 is a vacuum-melted stainless steel from US based Carpenter that is often likened to AUS-8 and 8Cr13MoV with many putting it slightly ahead of those two based on superior edge holding. With slightly more chromium it also achieves better corrosion resistance. CTS-BD1 has mid-sized chromium carbides (hard, wear resisting particles) it takes an edge relatively easily but not on par with the wear resistance of high carbide steels like 154CM.