The wicks on the "old" style Kanger duals are made of silica, which is another name for glass fibers. They will wear out from use eventually, but stored they'll last indefinitely.
But if you're going to be rebuilding, you'll be replacing the wire and the wick anyway. As for the other parts... The coil housing (including the ribbed chimney) is made of stainless steel, which is very durable and corrosion-resistant. There's a tiny little stainless steel pin that forms the positive contact too. The insulating grommet on the base may be opaque white and is often termed "rubber" (although I understand it's actually just a stiffer grade of silicone rubber), or translucent silicone rubber. The "hat" that slides over the chimney is silicone too.
All of these parts are resistant to a wide range of chemicals and conditions. Nevertheless, I would suggest washing them well and drying them for long-term storage.
It's good that you're saving these. But don't store them out-of-sight. Look upon them every single day, and wonder about how much money you can save, and the fantastic vapes you can experience once you learn to rebuild them.
In fact, if I were you, I'd get some kanthal and cotton today.