The Caen, France-based design agency Murmure made these memorable and heavy business cards. You probably can't fit many in your pocket, but you can stack them on wooden pallets, built to scale.
Link (Google Translate) | Agency Website
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It shows how real business cards are still here to stay, now to find a way to get the info from the real world into your digital address book in a n effective way and not just scanning it!