Swords makers have long known that the ideal blade is a combination of different steels, each chosen for its unique properties. This is the secret of the samurai swords of legend. Now it's also the secret fo Kershaw's new composite blade knives. In a composite, the steels retain their own qualities while interfacing with each other and acting in concert. The patent pending technology that makes the modern composite blade possible delivers exactly the type of steel you need where you need it. Each blade's spine features Sandvik 13C26. But the cutting edge is built of CPM-D2 for precision sharpening, edge retention, and corrosion resistance. It's the perfection combination of resilience and cutting ability.