brass all except a few things like the actual part of the temples that touch the ears which are stainless steel (implant grade so they are totally hypoallergenic (316L)) and the nuts to the screws are all steel but the screws themselves are slotted solid brass.
it may be hard to see but the lenses have a heated brass mirrored finish.
you can see all of the pictures and use our contact page on the
main web site here and a
direct link to goggles page