I really like using note cards for all sorts of things. This size is the best for keeping a running inventory of things around my house. I have a large file box they fit into. I can find just about anything I need in very little time when I use these. I want a particular thing like a certain notion for my crafts and sewing. I just flip to the card and on the card I have put exactly where I have put it as which drawer and how many or how much I have left. Saves time in the long run. I have done this with tools fabrics books and just about anything.
I ordered the wrong size these were useless to me. And of course the pack is huge so I'm not just wasting a few but 500. Even if they were the right size they are so thin and flimsy that they would not have served thier purpose anyway. I need something more durable than this. But you get what you pay for and they were priced right. So if this is the size you need and you don't mind something not much thicker than good copy paper then you would'nt mind these index cards. Otherwise a more expensive brand is necessary to get a thicker card.
If you are looking for typical card stock index cards these are not for you! These are not anything like the index cards you used to find that are a nice heavy weight. These are more like slightly thick paper. The issue is that you can only write on one side or it will show through and that they won't last long in a card file box. The price and quality to no match and neither did the description. Very disappointing.