This cartridge is a spotting cartridge/trainer for the Instalaza C90-CR (M3) 90mm shoulder mounted rocket-propelled grenade launcher and was developed during the 1980’s. It is produced by Instalaza SA, Spain. Apart from the Spanish Army, Marines, Air Force and Guardia Civil, the C-90 system is currently used by several military forces, including Colombia, Ecuador, Estonia, India, Italian Special Forces, Indonesia and Malaysia.