... The length of thread bobbin is 30mm-43mm, dia is 10mm-15mm description:BJ-02DX 1. Our machine installed High-speed ... bearing for operating bearings, enlarged the working fime, and makes the rounding thread axis rotational ... the thread, not easy to offer the thread, more uniform pattern, more three-dimensional sense. Automatic Bobbin Winder/Automatic winding machine BJ ...