Schmetz Topstitch Needles are for top and decorative stitching with multiple threads and for embroidery repair. These sewing machine needles have one flat side on the shank (the top part) to fit into your machine and the size is in nm, which is a tenth of a millimetre. This pack of 5 needles comes five of the same size 100nm needles.
The needles have a very long eye, approx. 2mm in all sizes, in comparison to the Universal or Embroidery needles.