K390 MICROCLEAN® is a state-of-the-art cold work tool steel made by Böhler-Uddeholm. Specially formulated to withstand the rigors of demanding industrial applications, its advanced alloy composition also makes it an exceptional blade steel — and the defining feature of an elite family of Spyderco lightweight knives. A proud new addition to this breed, the K390 Endela showcases this remarkable blade material in the perfect “in-between” size for an everyday carry knife. Its Bi-Directional Textured™ handle is also injection-molded in the distinctive blue color reserved for this high-performance family of cutting tools.