Just out of 2mm alloy sheet. I'm unsure of the grade. They weigh 340g ea. Rigid enough.
They are pretty big (though not as big as the doors, they are the same ones from the previous page). Who knows if they provide any benefit, until we get them on. We're going to make up some smaller more convention ones as well, just to see what the difference maybe.
There is a theory that lowering the profile of the end plate after the gurney will increase it's effect.