This product is handmade. Please refrain from purchasing if you are looking for perfection. It's a card case! I use it by attaching patches of my favorite characters and animals! It can hold cards, of course, but also money and keys, so I use it when I go out for a bit! I attach my favorite accessories and keychains to it♪ You can also attach a carabiner. ⚠︎When attaching patches with an iron, avoid the buttons. The button closure may be a bit stiff.