Enjoy the Quilters Select L Style Prewound Bobbins (10 pk) and stop wasting time winding bobbins to coordinate with your projects. The Quilters Select Prewound Bobbin Sets contain Para Polycotton Thread; a versatile, 80wt thread perfect for sewing, quilting, and crafting. This polycotton blend has been thermally treated, removing stretch, shrinkage, and weakness, and it has a high sheen that gives every project a professional finish. Para Polycotton Thread 440-yard spools are available to match each bobbin thread. Each L Style bobbin contains 135 yards of thread.