Sticky Note and Pen holder for Fridge

My co-workers wanted a way to mark the food in the shared fridge with our name and date without having to permanently mark our containers (otherwise food would be forgotten/wasted). The sticky notes and pens were out of sight and out of mind so I created this to stick onto the fridge.
This thing has 3 holes in the back to fit the magnets I had spares of, about 4mm dia. and 3mm deep, but you might have different magents.
The holder can fit either the 3in. or 2in pads, the slot cut in the cente