Hi there Edelgado, Thank you for selecting Next Day Flyers for the printing requirements. We have a wide variety of cardstocks for flyers. Evidently, we don't have a water-proof substance however Now we have drinking water-resistant cardstock. The scale of the A5 piece of paper is 5.eighty three x eight.27 https://flyer-printing56555.bloggerswise.com/39165865/an-unbiased-view-of-flyer-printing