Can I put paper or metal cards inside my cardholder?Updated a year ago

Our cardholder wallets (E.g. Parliament Wallet & Aluminum Cardholder) were designed for standard credit card-sized plastic cards. We advise you not to use paper or metal cards inside the cardholder of wallets. Paper may jam the mechanism, and metal cards may slide out easily.

The card flap of the Parliament Wallet however is suitable for metal and paper cards. 

The Modular Bifold doesn’t have a card ejection mechanism so you never have to worry about cards getting stuck. Feel free to put paper or metal cards inside any of its pockets.