Contents are exactly the same as in our live units, except there is no "OC" in them. These are not water units. This is because our formulas are heavier than water, and if we substituted water it would not replicate the spray patterns faithfully. Additionally, don't be surprised if you get a "red" face when exposed to them...this is because the inert formula is not water. But if the formula has a "kick" without "OC" just imagine how it is when we add the fire!