holder for RFID-chips

Need something to hold a rfid keychain in my car and be easily take and drop without being freely running.
So I saw the keyring holder of @The_E and looks perfect, except for the keyring part and the lack of a place to put some blu-tac to attack somewhere in my car.
So here is the solution, also I've cut a little to be a little less solid.

Thing in construction, not final version, still testing it