Mont. Code Ann. § 50-37-101

The term "fireworks" means any combustible or explosive composition or any substance, combination of substances, or article prepared for the purpose of producing a visible or audible effect by combustion, explosion, deflagration, or detonation and includes sky rockets, roman candles, daygo bombs, blank cartridges, toy cannons, toy canes, or toy guns in which explosives other than toy paper caps are used, the type of balloons which require fire underneath to propel them, firecrackers, torpedoes, sparklers or other fireworks of like construction, any fireworks containing any explosive or flammable compound, or any tablets or other device containing any explosive substance.