The ISU series of assault guns were designed around the need for a well armoured, mobile, fully enclosed, and heavily armed tank that could withstand German anti-tank gun fire and keep up with armoured formations. The lack of a turret allowed for a large casemate that could support a crew of five.

Built off the IS-2 chassis, the three assault guns differed only in their main armament. The ISU-130 featured a 130mm gun based off a long range naval and coastal gun, the ISU-122 mounted the same gun as the IS-2, whilst the ISU-152 had a powerful 152mm gun-howitzer capable of firing powerful high-explosive rounds.

This set allows 3 different tank models to be built: ISU-130, ISU-122, or ISU-152 Tanks