Clear-Quilt bobbins offer a high luster appearance and are wash-fast and colorfast. Fil-Tec bobbins offer significantly more stitches per bobbin than standard paper-sided or machine-wound bobbins. Main Features An excellent lint-free ready wound bobbin designed for piecing and detailed quilting applications Clear-Quilt bobbins are produced from Egyptian grown cotton with extra long staple yarn Bobbin yarn is mercerized for lint free consistent tensions and uninterrupted sewing Clear-Quilt bobbins work in conjunction with thread sensors to alert user when bobbin thread is about to run out