I use these all the time. love them. They do offer ones with a color stripe for color coding. I also liked it when they use to offer solid colored ones. They are great to use with page protectors as dividers for a notebook.
Great for tabbing medical reference books. The tabs withstand mutiple use and don't bend. Easy to write on with Sharpie markers or regular pens, do not smudge. Just wish I could get them a little bit discounted for my students.