The card and the envelope are very nicely designed, high-quality and authentic.
If you fold the card again in the middle to fit in the envelope, it is DIN5 large.
Only we missed the Füllzeile for the place. To remedy this problem, we have the "Please bring with me:" erased with correction tape and written on "Please come here," and the 3-line address in the generous free space written underneath.
The "order" of the time we have crossed out and replaced by "from" and "up", so that parents know not only the drop-off but also the pick-up time.
In the rolled-up card edge below we still reingeschrieben that there by 16 clock also hot food which adults to take care of children (if the parents do not want to be there / can) and that the admission of the child is paid (if you not celebrating at home but in the indoor playground, the zoo, etc.).
I would buy the card at any time.