Scientific Fridge Magnets: The Momentum Operator

While typing up some notes on the hydrogen atom, I realised I *really* liked some of these equations and would love to display them in a fun way on my fridge (or whiteboard). After a quick search online, it seems you can't buy common quantum mechanical equations or operators as fridge magnets. I decided to change this.

Here we present the momentum operator [1], or more specifically, a sprue of casings to create your own momentum operator fridge magnets.

Simply cut the characters from the frame and glue in a magnet of your choice. The magnet casings are designed for a 4mm x 1mm round magnet (although the holes are 5mm x 1.2mm). Magnets are not included.

[1] https://en.wikipedia.org/wiki/Momentum_operator