uprated synchros?

There was this thread recently, which as you'll see seems to suggest that the standard new parts from Renault are steel... Any use to you mate?
 
Just frozen, you can't shot peen synchros(baulk rings)- you'll damage the fine surfacing on the inside which is used to both brake against the cone and also to clear the oil out via the gallerys on the inside of the ring.