How many cards can the Groove Wallet™ hold? Can your wallet hold metal or titanium cards?

Each Groove Wallet™ is designed to hold up to six standard, flat cards. If you need more space than that, be sure to check out our attachments. If some of your cards are embossed or metal/aluminum, that will decrease the capacity. Any heavier credits cards need to be slotted at the very back (top) of the wallet. Here are some card combinations that work best:
* 6 Cards with 1 embossed, 5 flat
*  5 Cards with 3 embossed, 2 flat
* 4 embossed cards
    
The groove wallet GO leather attachment can hold a maximum of 4 cards. It'll hold ID's just fine too. 

Check out this tutorial to learn more: https://www.youtube.com/watch?v=C-R4Mdke-ss