|QSL Card Trac is a heavy plastic back, with clear plastic "clip" tracks on the top and bottom. The average QSL card fits in very easily. The back has two pieces of double-sided foam tape to attach it to another surface.|
Mine arrived in good condition and went up easily. The 36" size doesn't quite hold 6 QSL cards, so it works best when you place them end-to-end. Be careful when putting them up, as it is easy to get the alignment just a hair off.
They do not provide any dust or archival protection for your QSL cards, so if you're concerned about that, you might want to find individual sleeves to protect the cards before you put them in the Card Trac.
Overall quality is good and I'll be getting some more, as I still have cards that didn't fit on the first three I bought.