Also called Sharp Needles. These have a very slim, acute point for easier piercing of very fine or densely woven fabrics. Use for precise stitching of edges, also for silk, microfiber fabrics, coated materials, foils and artificial leather. Size 90/14 is appropriate for machine quilting with a heavier thread like Superior's King Tut. Schmetz is a quality needle that will fit and stay inserted in your Singer Featherweight.