The basics Add the ready-to-use Dritz Class 15 Reusable Bobbins-Assorted Brights to your sewing toolkit, for use in your sewing machine. The benefits Thread is washable and dry cleanable. You can also use them for hand sewing projects such as quick repairs. The uses This pack contains 12 pre-filled plastic bobbins, with 50 yards of colorfast thread each. The bottom line Simply select your color and start sewing. Once they’re empty, you can refill them again with your favorite color.