Magna-Glide Poly Classics Style M Jumbo Pre-Wound Bobbins 230yds -White # 12445-M - 100 Pack
No. 60 Filament Polyester . Fil-Tec Bobbincentral's patented magnetic core creates consistent delivery through 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 bobbins.
