The ZTZ99 is the most higher level primary battle tank (MBT) of PLA. The ZTZ99 provides a substantial improvement in firepower, flexibility, and security when compared with older Chinese-made tanks. Some of the ZTZ 99 ' s technologies are regularly update the less expensive ZTZ96 MBT. The hull of ZTZ99 is extremely similar to that the T-72, but is about one metre much longer. The turret and hull are of all-welded metal armour construction. Leading arc on the turret can be added with a layer of composite armour, or arrow-shaped spaced add-on armour modules. The armour package is of modular design, enabling damaged parts become changed or upgrades installed throughout service life