emailed the mob I got the bonnet from and this is what they wrote--
hi, the bonnet is made from China factory. and you shouldn't get
trouble from police, because they are fibre glass base, which is
more than 50% on the bonnet, and the carbon fibre is only a
layer, which sit on top. you can explain to the cops that if they
are full carbon fibre bonnet, then will be illegal.
andrew