CPM-SPY27: Produced by Crucible exclusively for Spyderco (SPY), SPY27 is a high cobalt (atomic number 27) steel similar to S35VN. Hardness and toughness are close to S35VN, corrosion resistance is close to S30V, and sharpening response is better than both. SPY27 is a well-balanced steel for everyday use and comparable to many other PM stainless steels in edge holding, toughness and corrosion resistance.