Klasse&#39; Embroidery Needles Size 90/14" /> 5 German-Engineered Steel Machine Needles The Ballpoint tip prevents needle from piercing and breaking fibers. 5 German-Engineered Steel Machine Needles The specialty coated, larger eye allows smooth thread flow at higher speeds. Use this needle with rayon, polyester, cotton, or acrylic embroidery thread. 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