There is also a
YouTube video now revealing some more information.
Nice find.
I don't like hos glossy Tangem Ring looks, but IP68 is not bad, maybe you can take a short swim with your hardware wallet.
I saw on Tangem twitter account they gifted 100 Tangem Ring prototype wallets to visitors in cardano summit , this was not a bad marketing move from Tangem.
The ring is made of a ceramic material and is water-resistant.
Material mention in video is zirconium dioxide, I don't think that is ceramic, it's more like a metal.