Schmetz Stretch Needles have a medium ball point; special eye and scarf area prevent skip stitches especially in highly elastic materials. For elastic materials and highly elastic knitwear. 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 which are 3x 75nm and 2x 90nm.