If anybody has checked the site posted earlier,
I'm pretty sure when he says "poly" he means
polypropylene.

http://globalflyfisher.com/fishbetter/indicators/


Polypropylene has a specific gravity
of .9 and will float (barely) since water is 1.0

Some of the other "polys'"  have specific gravities
higher than water.  They may still work as strike indicators
 though, and float with trapped air in the fibers.

Gary Webb

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