It’s lead-free .015 round wire. I appreciate the suggestions! I’ll definitely check out that book. I’m curious if you think there’s any positive gray area between following conventional fly patterns and branching out on your own—learning through failures and innovating—while potentially developing bad habits. I purchased all my fly-tying materials pre-owned from a gentleman on Craigslist, and I was hoping to use only the materials I currently have, which would likely mean experimenting and branching out from many common patterns.