Style L Prewound Magnetic Core 70D/2(60WT) White Embroidery Magnetic Bobbins(144 Bobbins)

High Quality: Made of high-tenacity 70D/2(60WT) filament polyester, soft and strong, not easy to break, no hair, effectively reduce friction and static electricity in embroidery and sewing. Magnetic Core Bobbins: The magnetic core holds the bobbin securely in the metal bobbin case, maintaining continuous tension throughout the life of the bobbin. Please remove the Anti-spin Spring from the bobbin case when use magnetic bobbin. Pre-wound: Using pre-wound polyester bobbin can save time and thread, and the same bobbin can keep the thread trace flat. L Style: Size as 2cm x 0.9cm. Type L (SA155) prewound bobbin threads fit particular commercial and home embroidery or sewing machines. 70D/2(60WT): 70D/2 is thinner than 75D/2 though it's hard to tell. Our 70D/2 is made from high-tenacity polyester, tougher and longer，can be used at high speeds without any problems. NOTE: A bobbin's dimensions (height and diameter) is called its style or type. Each sewing machine is designed to work with a sp