This is the Russian 57mm S-5 (C-5), a High-Explosive (HE), fin-stabilised, Solid-Propellant (SP), Air-to-Ground-Rocket (AGR). This family of AGR, designated S-5 (1st designated ARS-57), was developed to provide the Russian, Bulgarian and Romanian armed forces with a series of different rockets to cover a range of ground attack applications.

The S-5 series of conventional unguided rockets comprises a warhead, a Solid-Propellant (SP) rocket-motor and flip-out tail-fins for stability. The fins fold around the rocket when it is stowed in its launch-tube, springing back as soon as it leaves the launch-tube. The S-5 is a 55mm calibre unguided rocket fired from a 57mm calibre tube. Its intended use is for fighter-bombers and helicopters but many recent conflicts have seen improvised ground-based firing platforms.

In-flight the fins provide stabilising spin to the rocket, spinning it at approximately 750 rev/min. The warhead is armed at around 250m after launch.