The Merrow MG-3U is a 3-thread industrial sewing machine that is meant for putting a decorative edge on emblems and patches. It makes a 1/8" to 3/16" stitch at a standard rate of 28 SPI (though this can be decreased or increased to 20 or 40 SPI respectively), yet even while running at 5500 RPM still operates under 90 dbA. The MG-3U carries a 10 year warranty, though it is expected to run for years after that with routine care.