This is the back of the magnetic perpetual calendar that was originally designed by Stacey Carter. Check out her sample, it will give some more details and it will lead to her blog... Cookie Sheet Calendar by stacey carter at Splitcoaststampers
...we had the opportunity to do these at Diva Days back in January.
Some additional info... I decided that I wanted to laminate my numbers and Months before adding the magnets. As you can see, you can store all the extra months magnets on the back.