/usr/share/espeak-data/voices/mb/mb-us2 is in espeak-data 1.46.02-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | name us-mbrola-2
language en-us
language en 7
gender male
phonemes en-us
dictrules 3 6
stressLength 170 135 205 205 0 0 245 275
pitch 82 117
voicing 80
mbrola us2 us_phtrans
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