20 per jar

Egyptian long-staple cotton. 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. These Class L bobbins are suitable for most domestic sewing machines.

• Color: Black
  
• Recommended Needle Size: 65/9, 4.0 Longarm
  
• Made of: Cotton
  
• Recommended Use: Bobbin thread
  
• Thread Weight: 50wt, 2 ply
  
• Length: 74yd

From Fil-Tec Inc