The article points out the different phonetic features of Slovak, Czech and Polish, and particularly takes into consideration the peripheral features. The main contribution of the article is the presentation of two different hocalic segments [i:] and [ı] that occur in Slovak and Czech. So far a sufficient attention has not paid been to their qualitative difference. The differentiation of these two segmental elements is important for further analysis of phonetic aspect of the languages. The problem of occurrence of two vowels [i:] and [ı] is interesting from the point of view of Polish segmental system, which phonologically uses the opposition of [i:] a [ı] vowels with similar qualitative contrast.