Klasse Ballpoint Needles have a more rounded tip that pushes the fabric fibers apart to prevent skipped stitches in knit as well as runs and puckers. Great on cotton knit, interlock, rib knits, fleece, and other knit fabrics. Use with polyester or poly cotton threads. Needles fit any front-to-back threaded machine. Size 80/12. 5 pc.