Great for Scandinavian style flies which have a short compact body and fewer materials, while maintaining excellent swimming and sinking characteristics. The Pro Microtube has a larger butt section to add a striking point, a tap for mounting the Pro Hookguide and a shaft for mounting the desired style of weight. All types of Pro weight series fit snugly onto the shaft of the tube, giving the tyer a versatile system to tie killer flies fast. 12 pieces/package. Watch a fly tying video. Note: A Pro Tubefly Needle (sold separately) is recommended for tying with Microtubes. These tubes do not set well on most tube mandrels.