FYI, it is 31.6 cm high by 22.4 cm wide. There is a scale from 0 to 30cm on the right of the block, it's like a rule (we see a bit of the photo).
The rear of the block is not fully magnetic, there are 2 round magnets on the upper block (integrated inside) + 2 other magnets in the flap that holds the leaves. When I saw that, I said "Ouch!" But in fact, the result is that it really holds well, these magnets are powerful enough air (it sounds much more powerful than some blocks that have a great magnet on end while the rear).
I did a test to see how many sheets maximum we could put in it. Up to 15 A4 sheets, is nickel, and it fits perfectly on my fridge, no slipping.
From 16 sheets, it is more of everything, it's like losing the flap (the flap that holds the leaves that completely detached when there are too many leaves) so no more than 15 A4 sheets whatever our use.
In short, a magnetic block door in my opinion, has an excellent price / quality ratio, which is very convenient.