"Handwriting" a message on a sheet of paper requires a lot more - physical - space than simply printing it. There are cast-iron physical limitations that need to be considered. If you have a draft of your text available, this is the place to check in which "handwritten" Pensaki letter formats the text would fit in.
All you need to do is:
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Postcard-DL (biro)
Postcards DIN long (210 x 105mm); written with ball pen; min. order: 1.000 units
More info.
Postcard-A6 (biro)
Postcards DIN A6 (148x105mm); written with ball pen; min. order: 1.000 units
More info.
Postcard-DL (ink)
Postcards DIN long (210x105mm); written with ink pen; min. order: 1.000 units
More info.
Postcard-A5 (ink)
Postcards DIN A5 (210x 148mm) written with ink pen; min. order: 1.000 units
More info.
Card-DL-400 (ink)
Compliment Card DIN long (210x105mm); written with fountain pen; min. order: 500 units
More info.
Card-DL-200 (ink)
Compliment Card DIN long (210x105mm); written with fountain pen; min. order: 500 units
More info.
Card-DL-600 (ink)
Compliment Card DIN long (210x125mm); written with fountain pen; min. order: 500 units
More info.
Card-A6-350 (ink)
Compliment Card A6 (148x105mm); written with fountain pen; min. order: 500 units
More info.
LetterA4-1000(ink)
Letter DIN A4 (210x297mm) written with fountain pen; min. order: 500 units
More info.
LetterA4-650(ink)
Letter DIN A4 (210x297mm) written with fountain pen; min. order: 500 units
More info.
LetterA4-1300(ink)
Letter DIN A4 (210x297mm) written with fountain pen; min. order: 500 units
More info.
LetterA5-720 (ink)
Letter/card DIN A5 (148x210mm) written with fountain pen; min. order: 500 units
More info.