Brother TZTAPE PT-300 - Manual (Page 28)

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The size of the characters that can be printed are limited by the width
of the tape.
If a character size is set which is not shown in the above table for the tape width
being used and the PRINT key is pressed, an error message will be displayed and
the label can not be printed.
Tape width Possible character sizes
3/4”(18mm) 1, W2, H2, 4, 8, BIG
3/4”(12mm) 1, W2, H2, 4, 8
3/8”(9mm) 1, W2, H2, 4, 8
1/4”(6mm) 1, W2
Note: