... heavy fabric 3.high speed straight stitch sew Mini electric sewing machine SM-20UDifferential gear wheel body with reeling ... , and so on.SM-341This machine adopts a new method of rectangular compound feed that makes stitching nice ... attrition, low noise and long life. Suitable for sewing riding boot, gym shoes, leisure, sponge shoes, baby ... shoes, riding boots and so on. Mini electric sewing machine