The cards are standard 2.75" x 4.75" tarot cards. I recommend Fantasy Flight's tarot card sleeves - https://www.fantasyflightgames.com/en/products/fantasy-flight-supply/products/tarot-card-sleeves/
NecronomiCards Volume 1 has 110 cards in the deck, and Vol 2 has 93. There is a definitely possibility that by the end of this Kickstarter the Volume 2 deck could include more cards than that, because of stretch goals. These numbers do not include bonus cards.