Ambrosio Handlebar ribbon. You can get it here:
http://www.ribblecycles.co.uk/showPa...BRHBTP200&bike=
And that is likely the only place you can get it. And they appear to be out of white at the moment.
If you need some, PM me I think I have a couple boxes of white.
-Shin
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In life there are no mistakes, only lessons. -Shin