Hey all, for those that have Masterpiece figures, have any of you put the collector card in any sort of trading card holder?

I've seen some listed fairly cheaply online with magnetic clasps, but all trading card holders specify the thickness of the card (eg. 20pt, 55pt, 75 pt etc).

Do any of you know what is the thickness of the MP collector cards? I was thinking 55pt would be enough? They appear to be the standard 2.5" x 3.5" size, but I'm worried about the thickness.

Any help would be appreciated! Thanks