This listing is for one pack of 1 set of Schmetz twin/double needles. There are 4 size options. The number at the front indicates distance in mm between needles and number after the / indicates needle size. E.g, 2.5/80 means the distance between the two needles are 2.5mm and both needles are of size 80/12.

Double needles are actually two needles mounted on one shaft used to create two rows of stitches simultaneously. Use two spools of thread and one bobbin thread.

Schmetz is world's top brand in sewing machine needles. You can trust the quality and have full confidence in it.