Magnetic Core Low-lint, 118yds #50/2 Extra-long Staple Egyptian Cotton thread prewound on the bobbin. It runs clean, and lint free for uninterrupted sewing. Thread is washable and colorfast. The patented magnetic core provides flawless tension from the beginning to the end of each bobbin. Uniform tension equals higher stitch quality and results in more stitches per bobbin with less scrap and fewer bobbin changes.~