4 CCs, but you can get 5 cards in there if one of them is your DL.  You could put another card in the money clip portion to get a total of 6 cards in there, but then you wouldn't have room for cash.  I was trying to go minimal and it's been great.  Fortunately I carry a backpack to work and I've got all my other cards in my old wallet in there, but those things are more specific in use and I don't "need" them everyday.  This wallet has been great. 
 
  
 
Nope, smooth and easy to remove.