eckas said..Here's the pics. Draw your own conclusions.
(and just to be clear, the word 'severne' you can see in the pic is from another boom lying UNDERNEATH the boom that is the subject of this discussion).
The foam grip did say 'full carbon' (now says 'ull rbon' as my regripped section finished part way through the words!)and while obviously there are metal pins, plastic heads, foam grip, plastic rollers, my expectation is that the 'chassis' would have been full carbon.
I just re-gripped one of those on Sunday.
They are one of the better brand carbon booms.
The grip they use is rubbish but the glue is great.
The hardness of the grip is important, this brand is way too soft

They are definitely carbon, in the arm area they are very thin glass inner, carbon middle & very thin glass outer. (total thickness is about 1mm in some spots)
The seam is from the mould and I have seen them split there for some reason so I sand them smooth while re-gripping.
I am not sure this brand are one piece though, the head looks to be a separate piece from the arms.
I put another layer of carbon over the entire boom to get the diameter up a bit as I find they are too skinny, oh and to strengthen it a bit as it was smashed into 5 bits by someone, initials "Damo"

Hopefully it's stiffer & stronger than before