I would like this a lot except for being made from plastic.

Adjustable to 10mm, 11mm, 12mm, 13mm and 15mm height

Cool idea. Agreed though that the plastic is a bit sketchy.

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http://www.zencyclery.com

http://www.wheelbuilder.org

I find composite spacers often produce the mysterious creaking sound.

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Highline Search Group | http://www.highlinesearch.com | Outdoor & Sporting Goods Recruiters

In compression thermoset (and nearly all clear plastics are thermoset) work just fine, noting that CF headset spacers are over 50% plastic and the fibres don't do that much in compression......

I've looked at ally spacers of a similar design but they were heavier than CF ones, especially the lightweight (13g for 50mm) BBB 'formed' ones.

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Impoverished weight weenie wanna-be!
Budget 26" HT build viewtopic.php?f=10&t=110956

I use the clear version for 5000+km on the road. No creaking, no problems...