The graphite mixed into the polyurenthane is supposed to make them self-lubricating so they don't squeak.

Anybody know if these things work like the manufacturers (ES, etc.) say they do?

Here's an example:
http://www.performancesuspension.com/polymainpage.htm

 

I hope so...they're the only bushings that I would buy if I was replacing them...I have the motor mount inserts and the shifter bushings.

Austin

 

i have the ES master kit or whatever its called installed on my 91 CRX. its the red bushings. i used the grease that they give you when i installed them. so far no squeaks what so ever. Prothane doesn't make the graphite bushings. they claim that impregnated graphite makes the bushings weaker.
Just something to think about.