KLASSE sharps machine needles have a very sharp point for accurate stitching on densely woven fabrics where a rounded tip may deflect or distort the weave. This cassette includes five size 80/12 needles for silk, microfiber, quilting cottons, and neat buttonholes when precision matters. Use sharps needles for fine seams, detailed topstitching, and clean corners, and adjust needle size based on fabric weight and layering.