Hey travellingnomad! I'd also like to welcome you to Marriott Rewards Insiders! So excited to have you join us! Josh and team looked into your question, and have been informed that contacting Chase Credit Card Services would be the best way to find the answer you're looking for. They can be reached at 800-338-5960.
Thanks for posting! Please let us know if we can help with anything else
Thank you The specified item was not found. and lindseyh for the response. I received the card yesterday and it's actually metal. Thanks for the welcome message as well!
Both the premier and premier business cards are what are called "Metal Core" cards. It's a thin piece of metal sandwiched between two sheets of outer (plastic) coating, similar to the chase sapphire preferred card (and I think the united club card)
The only solid metal cards chase issues are the JP Morgan Palladium, and JP Morgan Ritz Carlton Rewards card. Though the marriott and csp card definitely are noticably heavier than a standard plastic card.