Polycarbonate vs Carbon spacers

[Devon]

I have recently read that Polycarbonate is lighter than Carbon. Now I'm not overly fussed about the difference in a few gs, however I am interested as to the validity of this statement, and if true, what the difference actually is?

[thprice]

Just to add to the choices that claim to be lighter than CF:

• Delrin (ExtraBolt 10 http://www.extralite.com/Products/ExtraBolts_anglo.htm)
• Magnesium (http://www.tune.de/tune-produkte/spacer-magnesium/)

I suspect the lightest headset spacers will have the best removal of unnecessary material, e.g.

[Devon]

I bet the Tune Magnesium one is fun in the rain

(This is a joke; I know it's coated)