Klasse' Metallic Needles Size 90/14 5 German-Engineered Steel Machine Needles The larger, unique coated eye accommodates metallic thread flow in a variety of stitch speeds. The large groove in the shaft prevents threads from breaking while stitching. 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