Picture 1:  What you see above is what you get, no more no less. Card color should be white, color above is not accurate.  Thickness is 1.8mm.

Offered here is  20 PIECES pieces of RFID Proximity Card/s for Door Access control. The size is about that of a credit card.  Each card is pre programmed with a unique ID and there is almost zero chance (say one in a billion chance) that two cards have the same ID.  Frequency rating is 125KHz. 

 If you do not like RFID card, you can also buy this tiny RFID key-ring token by clicking on this icon:.  The above RFID card is compatible with the door access unit that we also sell here: