The SINGER Assorted Stretch Machine Needle 11pc Set is a great set of pre-selected SINGER machine needles ideal for general sewing on swimwear, athleticwear, and knitwear. Assorted needle sizes allow you to choose the needle that best suits your fabric. The 5 piece SINGER Stretch Needles are designed with a deep scarf to prevent skipped stitches and a rounded point (less rounded than ball point needles) to pierce thicker fabrics like extremely stretchy clothing found in swimsuits, activewear, and yogawear. This set of 5 orange size 80/12 needles best used lightweight stretch fabrics like spandex, lycra, and suede. The 5 piece SINGER Titanium Regular Ball Point Needles are perfect when working on any weight of knit fabric. The Titanium coated needles help to avoid thread breakage, even at high speeds. This set includes 2 orange size 80/12 needles best used on lightweight knit fabrics, 2 blue size 90/14 needles best used on medium weight knit fabrics, and 1 purple size 100/16 needles best used on heavyweight knit fabrics. Finally, The 1 piece SINGER twin stretch machine needle offers a smooth sewing experience while creating two rows of stitches simultaneously. The design prevents skipped stitches when working with spandex, lycra and suede, as well as avoids shedding or breaking the threads.