This is a minimal and slim design holder card case with a cover that hides the card. The smooth cowhide with few pores further maximizes the subtle gloss and minimal design. The holder card case is a product that has both a luxurious design and functionality. The card slot has a duplicate recognition prevention function, so only one card is recognized, allowing for convenient use. *Please insert your transportation card in the slot opposite the symbol mark of Lumen. It has two functions: better absorption of terminal recognition and blocking of other cards. *You can conveniently use frequently used cards by inserting them outside.