Voice-over recording in chinese for video tutorials (total duration: 55 minutes)

We would like to record voice-overs for our repair tutorials. We are searching for someone who speaks [langues] perfectly in order to avoid any accent. We will supply the texts that have to be read. The length of the videos varies between 1.30 and 5 minutes and the scripts have already been translated. The total duration of the 20 tutorials is about 55 minutes.