Each pack contains the following needles: 70/10 (1), 80/12 (1), 90/14 (2) and 100/16 (1). 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.