Many fly tiers have found out how nice and easy to use the Stonfo Elite Disc Drag Bobbin is. Stonfo is becoming more and more popular in the world of fly tying tools and the Stonfo Elite Disc Drag Bobbin is one of the reasons. The drag adjustment discs allow you to dial in the perfect amount of tension to your fly tying thread. This bobbin is machined and features a hardened steel tip insert that allows the thread to slide easily through the bobbin.