Prewound Bobbin 10pc Cool Grey 3 (Silver). Fil-Tec Magna-Glide Delights 120x2 High Tenacity Trilobal Polyester No. 40 Tex 27 Prewound Bobbins. The magnetic core rotates the bobbin consistently throughout the entire bobbin which results in uniform tension to the last stitch. Consistent tension throughout the bobbin increases stitches per bobbin. This equates to more time quilting and fewer bobbin changes. No backlash or overspin issues. 10 M style prewound bobbins per jar. 132 yards of thread per bobbin. 40 weight. FILTEC M/Jumbo Style... - Prewound Bobbin 10pc Cool Grey 3 (Silver). | 
