The basics The Dritz Bobbin Box is a useful addition to any sewing kit. The benefits The see-through plastic case holds bobbins neatly in place while allowing you to view all the colors at a glance. The uses This lightweight box is capable of holding 21 regular bobbins or 42 Singer 600 series plastic bobbins at a time. The bottom line Bobbin box measures 4x6x1.25 inches. Bobbins and thread not included.