These cards are sturdy. They have clear, pleasing print which makes them more enjoyable to use than some flashcards I have seen.
They have a hole punched in the top corner and this comes with four plastic binder clips to hold them together. You can toss away the box and they will be kept neat and orderly. I really like that because card boxes can get torn and lost.
I think this is a pretty good buy and useful to learn or even to refresh your memory if you've found yourself forgetting a few. lol.
But truly I got this for my grandkids and they will get to use them to help memorize their math when they get into that at school.