As you can see in the image below, the way actual bank credit cards are built is sub-optimal. This new design allow a significant reduction of plastic wastes and uses : as visible, up to 50% within this grid design.

Moreover, the sleeve allow a funny way to manipulate it and to store it, and, the hammer head is perfect to sync and log the card into debit machines.

Here you  can see another design, where the card is shaped like a flame while reducing plastic wastes. It could also be a leaf or a water droplet, and so on. The shape still allow the card to be inserted in debit machine.