Dritz - Ballpoint Needles Sizes 9,11,14 (65,75,90).
For most sewing machines. Use ballpoint needles on knit and stretch fabrics. Replace needles frequently, every 2 to 3 projects. Keep machine cleaned and oiled for best stitch quality.
For best results select needle size according to fabric weight. Lightweight 9 or 11. Medium-weight 11 or 14. Heavyweight 14 or 16.