Check the listing for details. Smhaen Professional Bobbin Holders For fly Tying Thread All Sizes. Condition: New. Listed at 50.65 USD. The SMHAEN Professional bobbin holder is the only super functional, micro adjustable tension fly tying bobbin in the world today. Whether you are a beginner or a professional fly tyer the bobbin delivers maximum thread control, thanks to a unique patented tension system, placed so you are able to adjust tension with only one finger, while still working on your fly. Thanks to the perfectly designed ergonomic frame shape, you do not even feel the internal tension system in your hand, A ceramic tube, and the well balanced bobbin holder, gives you perfect thread control.The Professional Bobbin holder is in two different sizes. A regular size, red and a midge size, blue. The regular size is perfect as an allround bobbin holder. If you are tying smaller flies nothing beats the blue midge bobbin, it is simply just perfect and born for this kind of tying. 4 options Pro Micro Blue, Pro Standard Red, Classic Micro Blue, Classic Standard Red. Features:-Ceramic tubeInternal tension systemPerfectly balanced weightFunnel for easy threadingFit for different spool sizesErgonomic gripsPerfect hold in the handTechnical Data:-Regular, Red Bobbin.19 gram.10 cm.Spool size. L=2,8cm to 3,35cm.Spool diameter ø2,5cmMidge, Blue Bobbin.17 gram.8,7 cmSpool size. L=2,8cm to 3,35cm.Spool diameter ø2,5cmclassic holder with ceramic tube for all spool sizes