As an upgraded version of KZ ZS10, the Pro features self-customized balanced armatures which include two 30095 drivers for highs, two 50060 drivers for mids. With this configuration, the sound is transient, dynamic, and bright in all respects. While maintaining the previous performance, the highs of this model is extended beyond 40kHz. After times of design and discussion, here we have this portable iem hard case. Its small but has enough space for the earbuds and earphone cables.