This is a very slim credit card holder made from aluminum. It is small and convenient to use, perfect mens wallet. easy to keep it in your back pocket.With a click all cards slide out gradually. A special coating inside prevent the cards from damaging and falling out. Plastic cards get often squashed into wallets. Become bent when put in back pockets and the chemical interaction with leather makes them brittle. As a result many cards will break within their first year of usage. The aluminum card protector prevents this.