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What material is this?

I want to make thin, plastic, somewhat flexible but durable circular filters to put on the end of my camera lens (called bokeh filters).  I found a tutorial on YouTube where this guy uses Ponoko to make them and order them.  But he doesn't mention which material he uses, nor the thickness.  Could any take a guess from looking?  Or would you happen to have a recommendation based on the needs I have described? 
Here is his tutorial. You can see the filter/material at 5 seconds in...
If you'd rather look it up yourself, rather than click the link, search for 'lasercut custom bokeh Jin Tsubota' on youtube and the tutorial will pop right up.
Thanks in advance for any help you can give!

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