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After destroying my Chase card yesterday [I got my new one today btw], and getting so many comments and questions about what the card is made of ( I guessed stainless steel ) I went to the secure message center at Chase Bank to once and for all find out what the card is made of. And the answer is: 
So we still do not know for sure! The only solution is to have one sent off to a secret lab, maybe in area 51 ( a site for the next MegaDO for Delta maybe? ) and have one tested. Who wants to go? – Rene
◘ Chase Sapphire Preferred® Card
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When I activated mine I asked what it was made of. I was told it was a titanium alloy? They could have been telling the truth, or not.
Jamie Dimon trying to keep this as a trade secret….
The metal itself has to be non-conductive in order for the magnetic strip to work. Aluminium has an electrical conductivity of 36.9 Siemens/m which is only surpassed by gold, copper, and silver.
It is rumoured that certain companies have patented their metal cards, but the most available candidate is titanium (2.4 S/m), followed by carbon steel (5.9 S/m), and tin (8.7 S/m).
insider tip: they use a lead based composite
@Sydney – oooo that would be bad. Don’t think so. But funny! – Rene
Titanium is expensive, so my guess would be 304 stainless steel as the material for the Sapphire card. Unlike the “higher” stainless alloys, 304 is (like the card itself) attracted by a magnet.
Very good post,thanks for the post.