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Ummm.... Mail GW about it? I have no idea, really.
They are colored acrylic rods that are available (in many colors!) if you do a little poking on the Internet, or possibly at your local craft store. As an example, check out hobbylinc.com. I've never purchased from them, but do a search there on 'acrylic rod' and it'll give you an idea of what can be found. Necron rods are 1/8" diameter, I think?
"My tanks have names, my men have numbers." -Col. Edmund Grahvess, 23rd Kronecker Prison Guard