Size 70/10 is perfect for lightweight fabrics 5 packs of needles. Each pack contains 5 needles, for a grand total of 25 needles. A very slim needle with a thin shaft that helps make very straight stitches The shank(top part) of these needles have one flat side and one rounded side. These will fit all "household" models of Brother, Janome, Singer, Pfaff, Bernina, Viking, Elna, Kenmore, Baby Lock, Simplicity, Necchi, White and many others.