Each pack contains the following needles, one each: 70/10, 80/12, and 100/16. Then two of 90/14. Titanium needles stay sharper longer. Topstitch needles have a larger eye and deeper groove. Good for quilting, applique and embroidery.
I wrote a blog post about these needles here. It includes a chart on when to use what needle depending on your thread weight.
