Sideless Magnetic Core Machine Embroidery Bobbins Style L - White 100 Bobbins - 135 yds/Bobbin ------------------------------------------------------ The P-15 Magna-Glide magnetic core machine embroidery bobbin is wound with the industry standard twisted polyester thread, similar to the Coats V-15 embroidery bobbins. The Magna-Glide embroidery bobbin is an extremely smooth sewing bobbin with constant tension delivery and no backlash or overspin. Magna-Glide embroidery bobbins work best in embroidery machines with metal bobbin cases |