Need help finding something (type of button)

I have this thing,

It's a button, but its large (6' x 6'). Not sure what to call it or I'd look for it on google. Does anyone know where I could get more these? or do I have to make my own pcb for it.
It's from an old DDR pad I had.

Looks like the base for a "carbon membrane switch". Although being that size it could be a rain detector sensor.

Are there anything kind of alphanumeric sequences (series of numbers and/or letters) printed on it? If there are one of them is probably a part number. Another route could be to search for the name of DDR pad it was originally, someone might have done a tear-down on one and have more information about the parts.