KLASSE leather machine needles use a chisel-style cutting point to slice into genuine leather so stitches form cleanly without excessive resistance. This cassette includes five needles in assorted sizes 90/14, 100/16 for leathercraft and repair work where a standard needle can struggle to penetrate. Use them for leather, suede, and similar materials, and test your stitch length on a scrap piece to avoid creating a perforation line.