thanks for the help, it seems that they are stainless just unpolished and unused.
i didn't doubt the integrity of motad, i just thought they might have sent the wrong item.
the price also made me think i might have ordered non-stainless, £110 including postage is pretty good for a set of cbr headers.
i've now got the joy of removing 6 tiny 20 year old studs, just behind the front wheel with almost no mudguard, let the swearing commence!
much easier on the enfield, push fit with one large bolt.
bullet350