It can cut through steel
like it was RUBBER.
The Big Bang Theory Season 2, Episode 12
Not the brush part.
Just the little RUBBER thing...
The Big Bang Theory Season 4, Episode 6
I do. I tested their object
permanence with a RUBBER duck,
The Big Bang Theory Season 12, Episode 17
...and glued a big-eyed RUBBER alien mask
to the outside of my window.
The Big Bang Theory Season 6, Episode 2
The pencil's RUBBER.
The Big Bang Theory Season 4, Episode 18