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The Benchmade 5400SBK Serum AXIS Dual-Action Automatic Knife G-10 Black Serrated Edge. The Serum is a versatile setup with the ambidextrous AXIS Dual-Action mechanism, comfortably milled G-10 handle, and modified drop point blade. The 5400SBK model has a black finished 154-CM steel blade with a part serrated cutting edge and black G-10 handle with a reversible tip-up carry pocket clip.