I could be wrong - only felt it once while it was still there but it didn't feel rubbery. For instance, like the frame plugs on the side of the bike.twflybum said:Hmmm.. interesting. Mine is rubber. (bike manufacture date - 7/11)
It does fit loosely and comes out with almost no effort, but is definitely not plastic.
Will know for sure when the new part comes in. You're probably right, it just felt hard like plastic.