This tool is really wonderful for helping you memorize kanji! I highly recommend giving it a try.
I really like my kanji flash cards! I keep the set I'm studying clipped onto my bag, so they go with me almost everywhere. They're holding up well so far despite not being in their protective case most of the time. And they're super helpful to quickly glance at while I'm on break at work or anywhere else that I have a quick second. Definitely a worthwhile investment for me.
The poster is A3 size. It is exactly twice the size of A4 or 11.75 x 16.50 inches (29.7 x 42.0 cm) in size. On the poster, Hiragana is printed in large font and Katakana is printed in small font. I personally find Katakana much harder to learn than Hiragana even though Katakana looks structurally simpler. Therefore, I purchased a poster from Kioku and posted the poster on a wall near my desk at home so that I can easily look up whenever I study Japanese.