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If you are frustrated by the unsightly bird's nests of thread that develop on the back of your project, these little rings are for you. Made of tough, durable and super slippery Teflon, they eliminate the backlash and bird's nests that are created when you change direction quickly at high speed. They are perfect for free-motion quilting, thread painting and embroidery. Simply drop in your bobbin case, replace the bobbin, and sew. They fit bobbin cases in all long-arm and home sewing machines
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