Peach Seed Jig Amber Bone CS Large Stockman knife is constructed with our Carbon (CS) steel. Some knife lovers will settle for nothing less than Carbon Steel blades, since this special formula of alloyed steel is the "original" Case blade steel. Case Carbon Steel blades are known for their edge-holding ability and easy re-sharpening. However, they are less resistant to rusting, pitting and discoloration than stainless steel. We recommend keeping a thin film of oil on the blade