Historical information
Used to hold cards (e.g., bank cards, public transit smart cards, etc.) on the back of a smartphone by sticking to it (or a case) on the palm-facing side. Advertises the RTBU on one side.
Significance
A recent item advertising the RTBU.
Physical description
Dark blue rectangular card holder with the URL for the RTBU, its logo and slogan ("The power of Union"), and its phone number. All text is printed in white. The opposite side has 3M 300LSE tape that is covered in protective paper.