The pack of 4 SINGER ball point sewing machine needles allows you to perform multiple standard stitching projects on knit fabrics. Ball point needles are best used on knit fabrics. Machine needles are color coded to their sizes, which include: green size 70/09 and orange size 80/11 for use on lightweight fabrics. The needle kit comes in an easy-to-store plastic container with sizes marked on the cover for easy location and replacement. SINGER sewing machine needles can be used on SINGER, Brother, Kenmore and other quality sewing machines.