. A twin or double needle is actually two needles mounted on one shaft and is used to create two rows of stitches at the same time. Using two spools of thread, each thread passes on a different side of the tension discs and feeds one of the two needles. Twin needles come in a variety of needle sizes and widths between needles. The twin stretch needle features a ball point tip and a special eye and scarf for sewing stretch fabrics. Size 75, 4.0 mm width, 1 per package