Stonfo Compact Disc Drag Bobbin has a shorter and finer tube than the standard version for detail tying. This machined bobbin has a hardened steel tip insert and countersunk feed that will allow thread to glide through the tube for threading and tying. The drag control has a large adjustment zone for fine tuning thread tension to your personal liking.
Stonefo Fishing Tackle, Italy offers a superb line of fly tying products. Hit the link to check 'em out.