This model set includes six numbered Monopoly Bank Cards for the Monopoly Electronic Banking game edition, circa 2013.  Each card features a specific raised bump that triggers switches inside the Electronic Bank Unit.  Activation of the switch or combination of switches is unique to the player number, 1 through 6.  During gameplay, the Electronic Bank Unit keeps track of credits and debits.  This model set is useful if you lose or damage a card and need one or more replacements.  The card models in this set do not require any electronic attachments or modification - as long as you have the Electronic Bank Unit that is part of the original game set, they will allow you to carry on gameplay.