Easy to open with one press of a buttonDistinctive black tray with a clear plastic cover Includes 20 pieces A-Z guides for organization Storage capacity: Storage up to 550 cards, depends on the thickness of the cards Fit for business card size 2" X 3-1/2". Box dimension: 146*101*75 mm It doesn't work with rolodex fill card Eagle push-button business card holder, constructed of premium plastic, can store up to 350 cards. It features with streamline designed clear cover, which breaks through the stereotypes about business card holder, makes it look fashion yet functional. 20 pieces of A-Z alphabetical index cards (included), help you locate the business card you need quickly and easily. Great business card organization and storage solution for someone who deals with plenty of cards. You will feel no more mess with it! Please noted: it does not work with Rolodex fill cards.