The copper Natrix With its 3.25-inch drop-point blade, this medium-sized Natrix makes a perfect EDC and offers solid performance. The blade is D2 blade steel, a high-carbon tool steel that's highly wear resistant, tough, and offers excellent edge retention. The denser-that-steel copper handle gives the knife has some heft-but it still comes in under five ounces. Over time, the copper will take on a patina, making each copper Natrix unique. Kershaw's KVT ball-bearing opening makes it easy to open the knife one-handed. A decorative pivot and backspacer add embellishment.