Fil-Tec Magna Glide "L" Style White Bobbins (QTY 100)
Sideless bobbins contain a magnetic core that creates a uniform tensioncontrol throughout the entire bobbin. No more interruptions for tension adjustments as your bobbin gets smaller. the magnetic core prevents backlash or overspin and eliminates the need for check springs. Also reduces lint and residual build-up in the bobbin case and tension spring.