The Type 054B is a class of multirole guided-missile frigate of the People's Republic of China. It is a development of the Type 054A frigate, and is around 15 m (49 ft) longer and 1 m wider than its predecessor. Compared to the Type 054A frigate, the extra length allows the Type 054B frigate to install SAM-based CIWS along with the gun-based CIWS, a heavier main gun and carry a heavier helicopter. The sensors are also upgraded, including a new radar. The Type 054AG frigate, the latest variant of the Type 054A, has some similarities with the Type 054B, including the main gun and helicopter.