The copper is so soft it files easy, but that also keep its for holding a very sharp edge. The hard part is making a round edge sharp, AND even all around, with a file. The smaller the diameter it becomes even harder to keep even. The graininess of wood can grab the edge of the copper and gouge if you're not careful, the but once you get a couple of inches in the pipe it runs fairly straight.
Here's some I've been working on. The smaller hooks are Mustad 33903 #8 kink shank. The larger are #2 kink shank saltwater "Perfect Popper" hooks from Wapsi.
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