Perfect for treating materials that are stretchy or highly elastic With their unique hollow groove structure and rounded centre ball tip, these high-performance "Stretch" sewing machine needles provide the optimum conditions for sewing work on t-shirt fabric, lycra, silk jersey, or knitted items. Impressively, incorrect stitching or severing the elastic fibres is avoided. Also, the superior quality of sewing machine needles for stretch materials provides durability even under heavy use. They are compatible with all common household sewing machines because to their flat shanks, and all common yarns can be utilised. Five 75-thickness needles are included in the economy pack.