Considering that the pre-order has already been closed (for now, it says 'additional quantities available soon'), I'd consider it more likely than not that these will be popular.
KW has it up again as a pre-order, not sure what that means exactly.
Are you able to compare it to the color of G10 on the Elmax PM2 BBS exclusive (C81GFGP2)?
Austenitic stainless steel (e.g. 300 series) is non-magnetic but ferritic & martensitic (e.g. 400 series), as well as duplex stainless steels are magnetic. Stainless steel fasteners can be found in both 300 and 400 series steels.