Originally Posted by
aaupgrade
I assume you are talking about the metal content of the RFID chip in the MR CC, as the CC itself is carbon fiber.
I am referring to whatever material is used to fabricate the Marriott credit card. Most Chase non-plastic cards are composites with a metal core to create heft, and only a small amount of more expensive external material for show. I do not know the composition of this specific card, but the presence of an EMV chip should not disrupt the operation of a contactless chip because there are many cards with both features.