I don't use any copper except for pressure flaking at times. I really prefer antler, stone, or wood for percussion. My tool kit consists of large, medium and small antler billets (moose and whitetail,) a selection of soft, gritty hammerstones (you don't want hard ones, just don't work well for percussion,) big hardwood billets made of dogwood, persimmon, or live oak for working rough rock like quartzite and rhyolite, and an abrader or two. For abo pressure flaking, tines work, but a tine set into a longer handle works much better.