Here’s how to disassemble a DC WMATA’s SmarTrip card and turn it into a keychain-ready size –“The SmartTrip card is composed of three sheets of laminated cardboard (or plastic; it’s tough to tell). The middle one is where the important guts are located. The outer two serve a decorative and protective function. The first order of business is to remove those outer layers. But before you do, resign yourself to destroying the card. You might be able to transplant its brain into a new body, but DCist doesn’t want any angry emails demanding money for replacement cards.” Link.
Dissecting the SmarTrip