The basics The Schmetz Microtex/Sharp Machine Needle has a very fine pointed edge, which makes it perfect for sewing projects featuring very fine to medium fabrics.  The benefits Works well with polyester, micro fibers, artificial leather, foil, silk and coated materials like laminates. The uses Great for piercing and general sewing.  The bottom line Each sharp machine needle in this pack is specially designed for straight stitches, topstitching and edgestitching.