I still use business cards often and these are a professional yet girly way of keep them.  Many women who have seen my understated blue flowery case love it and always ask me where I get it.  The price is very reasonable at 6 US dollars so there really is no reason not to get it!  It has lasted me for over a year now with no fading, no tearing, no issues even with living my my zippered pocket with a ton of things shoved in there as well.  Your business card holder is a reflection on you when you take it out in front of clients so make sure you get one that looks perfect for you!