One for each color.
You probably don't own a bobbin for every color of thread you own, but constantly switching out different spools of thread on the only bobbin you own can be annoying, so add a few extra bobbins to your arsenal of tying tools, so you aren't stuck trying to thread your bobbin every time you go to change colors.
- A ceramic bobbing for tying flies
- Durable steel and brass construction
- Thread tension can be adjusted by bending the wires