I think you mean film capacitors. While they usually aren't directional, often it is seen as better to hook one end to positive. they are usually marked by a long lead or a mark established by the OEM.
Jerry
In a speaker crossover, are film inductors directional or have polarity?
Tried asking this in the speaker forum, no responce. Thought I'd try my question here......In a crossover are film inductors directional? Are there general principals to what should connect to inner foil vs outer in regards to the flow of electrons? Would it matter if both speakers were connected in reverse to each other, ie inner foil to outer and outer foil to inner??