Precision-machined, aluminum bobbin spools for the Norvise Automatic Fly Tying Bobbin. Many fly tiers using a variety of working threads find it economical to simply change spools rather than have a separate bobbin for each thread. These spools hold from 50 to 500 yards of thread, depending on its size (diameter).
- 10 Spools per package.
- Plastic carrying case included.