Griffin's Magnum Ceramic Bobbin features an extra heavy duty stainless steel tube with double reinforced bands making it the perfect tool of choice for heavy handed fly tying work. With its smooth ground, finely polished ceramic tip insert, the Magnum Bobbin enables fly tiers to apply maximum tension while protecting fly tying threads from fraying or abrading. A favorite when working with high-strength 3/0 threads, Kevlar, GSP, and more; Griffin's rugged tough Magnum Ceramic Bobbin gets it done!