One numer each set 1 to 0
Yes I've used them several times so far just let them dry before use again
4"
The dimension of the card in the Stencil Set is 3-1/2” (w) x 5-7/8” (h). The dimensions of actual number is all height by 4”, but the width is from 1” (for #1) to 3-1/8” (for letter M).