just remembered, they also made these in fibreglass as well!
the long strand carbon fibre & the fibreglass whels look almost identical too
if they still have the stickers on the carbon ones will say CR150 (for carbon 1.5" wide) or CR175
the fibreglass will say FR150 or FR175, blue stickers for carbon & green for fibre
if they are not stickerd up though it will be hard to tell, but both are good, its just nice to think you have the carbon ones