THREAD CONE: Features one 3,000 yard cone of 40 weight, 2-ply polyester thread SEWING THREAD: Excellent strength and elongation enables smoother stitches with less puckering when sewing FUNCTIONAL DESIGN: The shape of the cone allows Sergin' General to easily fit on top of all serger machines without risk of tangling MACHINE USE: We recommend sewing with machine needles sized #75/11 or #80/12 VARIETY OF COLORS: Colors have been specifically chosen for their blending tone and ability to work with many different fabric colors Superior Threads Sergin General is the cleanest serger thread for all your serging projects. With excellent strength and elongation, you will experience smoother stitches with less puckering when sewing. The colors have been specifically chosen for their blending tone and ability to work with many different fabric colors.