Mars JA2-1 Sewing Machine is the most Economical, Robust & Versatile model in the Lock Stitch / Straight Stitch category and offers all the features that are needed for basic stitching. Features include auto tripping spring loaded bobbin winder for uniform bobbin winding and perfect stitch formation, a slide plate for easy insertion of the bobbin, and a calibrated dial type stitch regulator for Thread Tension Adjustments and easy drop regulator for forward and reverse stitch control for all your daily sewing needs.