White and Black thread. 123m x 144 bobbins per box. Smooth, fine, practical and ready to use. View SpecificationPre-wound bobbins are practical, always ready to use and have the same amount of thread on each bobbin, which means all bobbins can be changed at the same time without wastageManufacturer Code: PWB509BS(black), PWB509WS(white).]]>
