Schmetz Knit & Stretch 5 pk Combo, Assorted Needles and Sizes: Jersey 70/10, 80/12, 90/14; Stretch 75/11, 90/14. Jersey & Stretch needles have medium ball points. The eye & scarf differ. Use the Stretch needle when fabrics contain Lycra, Spandex or elastic. Use Jersey on knits and some stretch fabrics. Jersey and Stretch needles are sometimes interchangeable. Test your needle, thread, and fabric combination for stitch quality.