Dr. Slick Ceramic Bobbins- Bobbins are one of the most critical tools in fly tying since they must keep smooth tension on the thread spool and have super smooth inserts to apply the thread to your fly properly. Dr. Slick Ceramic Bobbins are the choice of many tyers. Superb quality and a storied tradition. Dual ceramic inserts and delrin feet. Come in 3", 4", and 4.75" lengths.