The RBR-120 mm M90[1] (nicknamed Stršljen, from Serbian: стршљен, lit.

'hornet') is a light-weight, single-use, unguided anti-tank rocket launcher.

The launcher is produced by Eurokompozit of Prilep, North Macedonia and Poliester of Priboj, Serbia, while the anti-tank rocket is produced by Sloboda of Čačak, Serbia.

[2] It is intended for use against tanks and other armoured vehicles in addition to fortifications and infantry.

The M90 consists of a disposable rocket launcher and a HEAT projectile which is propelled by an impulse-type sustainer.