Plosive Oral

Basque oral plosives have four pairs in as many articulatory areas: 

Each pair is distinguished from each other by the voicing feature, although there are other related factors like stress, for example. This opposition is usually neutralised in initial position of the word. /t/ y /k/ only occur in final position.

On the other hand, voiced /b/, /d/ and /g/ have approximant variations [β̞], [ð̞] and [ɣ̞] in specific contexts, especially in intervocalic position.

It should be noted that the situation of the palatal pair is different from the rest: the phonemic character, especially in the voiced consonant, is arguable. From a phonetic point of view, the voiceless consonant has a tendency towards affrication ([tʃ]), while the voiced consonant occurs unevenly and appears only sporadically in some dialects. Therefore, it can be described as a phonemic reduction process of the occlusive order. 

Aspirated voiceless plosives, bilabial [pʰ], dental [tʰ] and velar [kʰ], of uncertain phonemic character, currently only appear with some regularity in the Souletine dialect.