Magna-Quilt and Magna-Glide Delights Style L Bobbins, for Multi-Needle

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/Quilt is the original high-yield magnetic-core bobbins. These Class L bobbins are suitable most for Multi-Needle machines. 

Magna-Glide are white and polyester 
Magna-Quilt are black and cotton