The Butterfly-CU is the heaviest knife in the Butterfly lineup by a significant margin — 4.68 oz against the GM's 2.38 oz — and solid copper handles are entirely responsible for that difference. This is not a carry-light knife. It's a knife you carry because you want copper in your hand every time you reach for it, and you're willing to feel that weight as a reminder of what the handle actually is.
Solid copper is a different proposition from copper foil. The material is denser, has more thermal mass, and develops a patina that goes deeper and more complex over time — a living surface that records how and where you carry it. Copper is also antimicrobial, which is a functional property rather than a marketing claim. The handle will look different after a year of daily carry than any other knife in your collection, and different again from anyone else's CU carried under different conditions.
Stonewash blade finish sits practically against the copper — it doesn't compete for attention, it lets the handle be the story. Clip point geometry gives the 2.99'' blade a precise, controllable tip suited to detail work. Crossbar lock delivers the same solid engagement as the rest of the Butterfly series. Ceramic ball bearing pivot throughout.
At 3.77'' closed it carries compact. At 4.68 oz it carries heavy. That's the trade — and for the right person, it's not a trade at all.