These are two medium/small offshore patrol ships built for the Thai navy, with ship numbers 5 1 1 and 5 12, which were built by Shanghai Hudong Zhonghua Shipyard. The first photo of a ship under construction was exposed on the Internet at the end of 2004, and its design may be derived from the F- 16U or F22 patrol ship series for export launched by China. Type 054 Ma 'anshan patrol ship for China's own use was also developed from F- 16U, and the first two were also built by Hudong Zhonghua Shipyard. The first ship 5 1 1 was handed over to the Thai navy on February 14, 2005, and the ship 5 12 was handed over in February, 2006.

This new patrol ship is equipped with all kinds of western equipment, and the war system and radar come from Europe. Including ARGOS multi-purpose combat management system of Atlas Elektronik company in Germany, Selex Aran-30 2D multi-function search radar, TMX/EO launch control radar produced by Oerlikon Contraues company in Switzerland, and navigation system manufactured by Raytheon company in the United States, the whole structure can be called a simplified version of MEKO- 100RAN patrol ship sold by Germany to Malaysia. Thailand decided to completely use electronic equipment made in Europe, because the electronic system made in China could not meet the requirements of performance, logistics maintenance and parts supply on the patrol ship that Thailand bought from China. ARGOS combat system has three BM-2000 series multifunctional display and control consoles, which have storage and calculation capabilities, and can provide functions such as mission planning, navigation support, helicopter control, training simulation, recording and remote command, as well as all kinds of software needed for ground attack, air defense, anti-submarine, amphibious warfare, mine warfare and electronic warfare. The installation of ARGOS will be carried out in Thailand after the delivery of the ship, including the input of software. In terms of power, Atlas Elektronik claimed that the two OPVs used the diesel engine of German MTU, but China Ship Import and Export Corporation pointed out that the main engine was the diesel engine of RUSTON Man Diesel ltd in Britain; As RUSTON Man Diesel ltd has gone bankrupt, the Thai navy may choose the diesel engine of the factory because of its low price. The known armed forces on the ship include the OTO 76 mm fast gun, and the American harpoon anti-ship missile scheduled to be equipped will not be installed in the short term due to lack of funds. In addition, it is estimated that the ship should be equipped with small-caliber machine guns or cannons. There is a helicopter hangar at the stern, which can carry a medium/small anti-submarine patrol helicopter.