The cards are beautiful and come on a key ring holder that has a threaded screw opening. The cards are secure but you can easily remove a card if you wish and return it.The colors are beautiful. My favorite thing about the cards is that they are easily held next to yarn you already have. It's great to have the gradients right in front of you and next to other yarns. I haven't figured out the best way to store the cards so I can easily find them. Right now I'm just keeping them out and admiring them.