They are sturdy and are great for using dry erase markers on.

We use these with dry erase markers, instead of throwing out paper.

These heavy duty clear plastic sleeves, which you can write on with a dry-erase marker, are fantastic for protecting your written or printed school or work papers

I can use dry erase markers on them as well.

One of them ripped as I carelessly and quickly shoved 5 sheets into one, but that is my own fault