A full deck; each card is 3/8" wide x 7/16" tall, and there are 52 cards.
I'd give them a haircut to make them narrower...
This item is in Dollhouse 1:12 Scale.
Design Team Member Caroline Ouzts-Hay made a Queen of Hearts Deck of Cards Case! See the wide photo below. More info in the blog and/or see the supply list.deck 1 inch tiny 160522CH 160821BT