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Uneven double-needle design, double-thread parallel chained sewing, which can make products much firmer, credibility, flexible. Suitable for sewing thin and medium material, such as clothing ,knitting, leather etc.

ZJ3800 is a double-needle chain stitch sewing machine (parallel).
ZJ3820 is a double-needle chain stitch sewing machine (tandem).
ZJ4810 is a single-needle chain stitch sewing machine.