These are pre-wound Size M bobbins, wound with WonderFil's 80wt DecoBob™ cottonized polyester. Size M is what most longarm and midarm machines take — check your bobbin guide if you're not sure.

Two things set these apart from cheap pre-wounds. There's no glue or wax holding the wind together, so nothing gums up your bobbin case. And the bobbin itself is reusable plastic-sided rather than disposable cardboard. The 80wt thread is deliberately fine: less bulk in the seam, and a matte finish that sinks into the fabric instead of peeking through from the back.

Machine-wound bobbins also carry more thread than you can get winding your own, and they wind evenly — which shows up as more consistent tension, most noticeably in embroidery.

The Basics assortment is the one to own if you're only going to own one: black, white, antique white and grey will blend into the overwhelming majority of what crosses your machine.

The 4 Colors

• DBLM-101 Black
• DBLM-104 White
• DBLM-112 Antique White
• DBLM-113 Grey

Details

• Material: 2-ply Cottonized Polyester (DecoBob™)
• Weight: 80wt
• Bobbin size: Size M — 193 m (210 yd) per bobbin
• Contents: 24 bobbins — 4 colors, 6 bobbins of each
• Best for: Bobbin thread, precision piecing, stippling, machine embroidery, quilting top and bottom, buttonholes, hidden stitches
• No glue or wax; reusable plastic-sided bobbins