They are as thin as a regular piece of paper, not as thick as regular index cards are, Worthless.

Index cards are always useful to have around

The index cards are good for double-sided writing with pens and pencils, but they are not thick enough for Sharpies and the like

In the last two weeks, we've found these GIANT index cards are perfect for -- shopping lists- notes for the kids- study notes for AP Chem and

If you open it gently, you can keep the remaining index cards there, protected by the clear wrapper

I really like these index cards.

If you are to lazy as I was to go to the store this is a good option.