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on Orders Over $99K390 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.