As is normal in Persian, a medial glottal is weakened and in many instances elided. This is the case with the plural suffix ها hā, as well, as follows:

After a consonant, we simply get [ ا ] [-ā]; for example:

کتا با ketābā from کتا ب ها ketāb hā
‘books’
دفترا daftarā from دفترها daftar hā
‘notebooks’

چشما češmā from چشم ها čašm hā
‘eyes’

دسا dassā from دست ها dast hā
‘hands, arms’

میزا mizā from میزها miz hā
‘tables’

After the vowels and the final silent /h/ (which in reality represents a final short vowel [-e] from an earlier [-a]), the [-h-] is not entirely elided, but weakened and a glide occurs: