Bobbins are the critical tool in tying since they must keep smooth tension on the thread spool and have super smooth inserts to apply the thread to your fly. To this end, we have created twoseries of bobbins that handle these tasks with ease. Bothhave delrin feet for smooth tension on the thread spool, and have either dual glass or ceramicinserts for smooth application of thread to fly. These funnel shaped inserts allow for a smoother application of thread or other materials as the bobbin is rotated, and they cause less breakage than traditional pipe or straight edged inserts.FEATURES:Stainless Steel & Brass FinishDual Glass orCeramicInsertsDelrin FeetWARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov