Sources differ in recording characteristics of Parvin class vessels.
According to Jane's Fighting Ships, the ships have a standard displacement of 100t and 150t at full load. Conway's All the World's Fighting Ships puts the numbers at 105t and 146t.
The class design is 30.8m (101feet) long, would have a beam of 6.5m (21.3feet) and a draft of 2.5m (08.2feet) on the report of Jane's, while Conway's mentions the dimensions as 30.5m (100.1feet) × 6.7m (22feet) × 3.1m (10.2feet).
Both sources agree that the ships are powered by eight General Motors diesel engines totaling 2040hp that rotate a pair of shafts, but the engine models are variously cited GM 8-71 and GM 6-71. The system can reach a top speed of 15kn as stated by Conway's, albeit Jane's mentions 22kn. The ranges given for the class are 1140nmi at 17kn and 1500nmi at 10kn.
Original armament of the ships reportedly included five guns: 12.7mm and 20mm each two and one 40mm. French sources give one 40mm and four 20mm machine guns, as well as a pair of Mk22 Mousetrap and DC racks. As of 2015, they are reported to be armed with five guns consisting an old variant of Bofors 40 mm/60, a couple of Oerlikon GAI-BO1 20mm in addition to two 12.7 machine guns. They are also equipped with four racks of depth charge (with eight US Mk 6), and two missile launchers of unknown type are installed on them after refit.
The original radar was model 303 of Decca Radar, while the current surface search system is known to be working on I-band. The sonar is a high-frequency hull-mounted active attack SQS-17B but is allegedly unlikely to be serviceable per Jane's.
Crew on each ship of this class totals 20 officers and men.
The ships in the class are:
| Ship | Namesake | Pennant number | Commissioned | Status | |
|---|---|---|---|---|---|
| (ex-PGM 103) | Pleione | 211 | 1967 | In service | |
| (ex-PGM 112) | Mars | 212 | 1969 | In service | |
| (ex-PGM 122) | Venus | 213 | 1970 | In service |