For synthetic suede and elastic knitwear. Constructed with two needles on a cross bar from a single shaft. Sews two rows of decorative stitching at the same time. *The 2.5 and 4.0 represent the mm distance between the two needles BULK DISCOUNT (Can Combine Sizes) 1-10 packs @ S$5.80/pack 11 packs and more @ S$5.40/pack (Save $0.40 per pack!)