144 prewound Size L (SA155 / Style L / Size 9.4) plastic-sided bobbins, wound with 40S/2 spun polyester thread in Black. Designed for general sewing, quilting, and heavy-thread embroidery where a strong bobbin thread is needed.
Unlike embroidery where the bobbin thread hides behind the design, sewing and quilting show the bobbin thread on every seam back. Use Black bobbin thread with dark top threads for invisible seams and clean underside finish.
Decision Guide:
Dark top thread → Black bobbin (this listing)
White/light top thread → White bobbin (LPW-40S2)
Multiple colors → Variety Pack (LPM-40S2)
Embroidery only → 60S/2
Fits SA155 / Style L bobbin machines. Compatible with Brother, Babylock, Janome, Singer, Juki, Pfaff.
DOUBLELIN has manufactured embroidery machines, DTG/DTF printers, and machine parts since 1989. Our bobbins are produced in-house.