KLASSE sharps/microtex needles are designed for tightly woven fabrics where a very sharp point helps produce clean stitch holes and straight topstitching. This assorted pack includes sharps/microtex machine needles for domestic sewing machines, making them useful when you switch between fine, medium, and layered fabrics. Use the smallest needle that suits your thread, and replace needles regularly to reduce skipped stitches and fabric damage.