'thunder', also known as Houdong class) consists of ten fast attack crafts operated by Navy of the Islamic Revolutionary Guard Corps of Iran.

[1] The negotiations to sign a contract for the vessels started in 1991, but was delayed for some time over the type of missiles installed on the ships.

[1] The ships were manufactured at Zhanjiang Shipyard, China and were delivered to Iran in two batches, the first five in September 1994 and the remaining in March 1996.

[1] According to the 2020 edition of "The Military Balance" published by the IISS, the ships are equipped with two twin launchers that fire Iranian-made AShM, Ghader.

[1] Tondar-class vessels use Chinese SR-47A surface search radar and RM 1070-A navigation system, both working on I-band.