Prewound Bobbin Fil-Tec Magna-Glide M Poly Bl 210y. Fil-Tec Magna-Glide Classic Prewound Bobbins M-Style 67x2 High-Tenacity Polyester Filament No. 60 (Tex 12). The patented magnetic core creates consistent delivery throughout the entire bobbin. No more interruptions for tension adjustments as your bobbin gets smaller. Magnetic core prevents backlash or over-spin and eliminates the need for backlash springs. Magna-Glide is the original high-yield magnetic-core bobbin. 100 Black bobbins per box/210 yards per bobbin. FILTEC Magna-Glide Classic Style... - Prewound Bobbin Fil-Tec Magna-Glide M Poly Bl 210y. | 
