KLASSE-5 German-engineered steel embroidery machine needles. The specially coated wider eye allows the thread to pass through more freely at high speeds. The pontoon scarf reduces the chance of skipped stitches and thread breaks as the fabric is flexed up and down by the rapidly moving needle. The specially designed shaft also reduces the chance of needle breaks. Best for: machine embroidery on knit and woven fabrics. Use with rayon cotton polyester silk or acrylic embroidery thread.