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Mysterious 'strip' found on keybeds of digital pianos

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Yamin:
Hi guys, I have always wondered what the purpose of the mysterious strip found on the keybeds of digital pianos are. There seems to be a carbon line in the middle and soldered at both ends and in the middle. Doesn't seem to be connected to anything important :S and nothing is placed on top it when the keybed is assembled.
Thanks in advance.

ajb:
Test strip to verify correct manufacturing?  Measuring the resistance between those pads would verify that the carbon printing has bonded to the conductive tracks properly and that it's the appropriate thickness.

Yamin:
Thanks @ajb, so its a test strip? Do you happen to know any reference links online about these?
Once again thanks for the help

floobydust:
Polyphonic aftertouch uses force-sensing resistance, those keyboards aren't just on/off switches.

Yamin:
@floobydust the pressure sensor is underneath a red felt material and the keys touches that, but nothing touches these strips. The strips doesn't seem to connect to any signal lines. The schematic doesn't even show the strips.
Thanks

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