The SINGER Class 15J Sewing Bobbin Set is an ideal starter bundle for beginner machine sewists. Both the black and white and the assorted colors sets come in their own case, which is made of clear plastic for easily picking out the color bobbin needed, and the cases have snap-tight latches to keep contents secure. No more searching through a drawer or sewing kit full of loose bobbins and other sewing machine accessories to find the right color or thread weight for your sewing project. With this bobbin bundle, your thread bobbins will stay neat, organized, and easily accessible for your next machine sewing project. Details: Contains a total of 36 bobbins Total of 1,200 yd. of bobbin thread Class 15J bobbins are designed for use with Singer Futura Embroidery Machines series 2600s, 3900s, 7400s, 8700s, and Izek 1500 Contents: 12 unthreaded 12 in assorted thread colors 6 in black thread 6 in white thread