Great bobbin holder for tying small flies with thin threads.Adopted a ceramic tube suitable for ultra-fine threads.Teflon-coated integrated arm provides smooth bobbin rotation and stable tension to prevent thread breakage.The micro-slit foam set at the bottom entrance will prevent the thread from getting tangled in the arm, ensuring comfortable fly tying. Uses high-quality ceramic (zirconia) tube that prevent threads from breakage. A dedicated bobbin threader is included.By opening and closing the arm, adjust it so that the appropriate tension can be obtained. When applying strong tension to the thread, be careful not to apply too much load to the ceramic tube and break it