Kershaw Natrix Copper XS - Folding Pocket Knife - Model 7006CUKershaw Natrix Copper XS D2 blade steel. Copper handle. Precision function. The Natrix is based on brother brand Zero Tolerances 0770, which itself was inspired by the award winning ZT 0777. This one offers upgraded D2 blade steel with a stonewashed finish that goes perfectly with the intriguing copper handles. (Yes, copper.) Since copper is denser than steel, this smaller knife has some heftand a lot of style. You'll especially like the look once the