I created this so that I could keep track of food in my fridge once it had been opened, gone are the days of eating items which expired 3 years ago :)
You may find use for it elsewhere though.
Created to fit the cheap UK pens roughly 8.3 mm wide and labels measured at roughly 100mm wide.
I have used pretty large magnets to ensure it stays on the fridge 15x4mm, you will require 2 of these.
The best before labels I used can be found here
Similar magnets to what i use can be found here