This designer natural stone business card holder is made out of Black Beauty marble rock. It will make your office desk stand out elegantly.??It can hold 10-12 business cards The marble rock has been designed with passion by our artists. The size of the business card holder will be approx. 3-4". Since it is made out of natural stone, there may be a bit of variation in the stone and thats the ultimate uniqueness of the stone. Multiuse-This can also be used as an innovative stand or a holder for various other cards..