How are they made?

I am pitifully ignorant about valves.

look at it

how is  it made?

who attaches it so perfectly to the mat?

I have always suspected they actually grew the valves

in some vast tank

propagated from some valve mother kept alive

in the fridge and feed

a diet of nylon, rubber, some other long chain polymers

and of course a secret blend of 23 herbs and spices...

As for the attachment,

the process cannot be photographed.

My understanding

is that it can only happen during a full moon

Paul wears lavish ceremonial robes

magik incantations are solemnly uttered

a mojo hand and some black cat bones figure prominently ...

The attachment turns out perfect every time.