I have heard the cryo hardening only on the internet,and just in the last few years.I have ownned some Wonderedges since the 60,s and never heard of cryo until recently.I have never seen any literature or anything from the company saying it was so(just hearsay) please let us know your sources(not trying to be contentious,just interested in seeing something definitive).Otherwise it is just rumor.I really am interested in seeing something regarding the sources.John Crowley (the guy that was in touch with the former owner)has started a thread concerning this http://straightrazorpalace.com/showthread.php?t=18180 (perhapswe can confirm,or dispel the rumor)Best regards Gary