Cocoon bobbins are used on âschiffliâ embroidery & multi-needle lockstitch quilting machines equiped with shuttles. It is made of Cotton, Poly/Poly core spun, Spun Polyester, Continuous filament Polyester and Nylon 6.6 and other specialty products such as aramid threads. Size #6/#7/#10 ((Traditional shuttles and match with brand "Andrews, and Steppex") and #11. thread count: Ne40/2, 45/2, 48/2, 53/2,80/2, 70d/2,100d/2,70d/3, 150d/1