This needle type is excellent for heirloom sewing and decorative topstitching. The size indicates the distance between the spacing of the needles.
Since the needles are fixed on a nylon block, use it at slower speeds and not for prolonged periods of time.
With a unique curved design at the clearance-above-the-eye "CAE" stress point distributes pressure equally which makes Klasse needles much stronger then other flat conventional needles