KLASSE sharps/microtex needles are designed for tightly woven fabrics where a very sharp point helps produce clean stitch holes and straight topstitching. This pack includes sharps/microtex machine needles in size 80/12 for standard domestic sewing machines, making them suitable for silks, microfiber fabrics, and quilting layers. Use the smallest needle that suits your thread, and replace needles regularly to reduce skipped stitches and fabric damage.