What's this black piece of foam on keyboard ribbon cable?

Today I upgrade my hard drive to 7200 RPM one.
When I tried to lift out the keyboard ribbon cable connector by tearing up the yellow piece of tape on top of the black foam thing on top of connector, the tape stick a portion of the black piece thing up.
https://www.getdropbox.com/gallery/45605/1/MAC?h=4868f5
Now everything is running fine, no matter with the keyboard or the system.
I'm just wondering what that piece of black foam thing is for?
Will that affect the keyboard in any way?
Please help me clear up this mystery.
Thanks

It's just packing to help space the ribbon and stop movement/disconnection of the ribbon under duress.

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