What Thickness and Size Letters do you have??
Flex Letters are usually .020 or .030" Thick
.020" thick letters = A stack of 50 is about 1"
high.
.030" thick letters = A stack of 33 is about 1" high.
Rigid Letters are usually .060 or .080" Thick
.060" thick letters = A stack of 16
is about 1" high.
.080" thick letters = A stack of 12 is
about 1" high.