http://www.casexx.com/CaseXxKnivesForUse.asp Quote: Stainless (Surgical) Steel By far the most popular steel in Case XX, stainless steel will hold its edge longer than conventional steel and is very resistant to corrosion. In addition , it is an extremely strong steel. Chrome Vanadium Steel Known as the “old carbon steel”, one of the most common reasons someone buys a Case XX with chrome vanadium blades is because they can be re-sharpened so easily. A quick touch-up on a sharpening device will bring back the original sharp edge on a chrome vanadium blade. Many users who require repeated use of their knife throughout the day prefer chrome vanadium because of the ease of getting that sharp edge in just a little bit of time. Because of the high carbon content, extra care is needed to maintain the finish of the steel. Keeping a thin film of oil applied is the best way to achieve that.