Speaker wire polarity

[Hardworkingman32]

I have a speaker wire, but its not labeled at all. One has just silver on one side and the other side has copper with a very small strip of silver in it.
Which one of these is positive and which one of these is negative. There is no labeling whatsoever, no stripe. Nothing at all. The copper+silver seems more twisted and than just the silver. I want to make sure I have proper polarity setup for my sub.

 

[Kickstand]

Its whatever you make it
I usually make the copper side positive but to each their own
Whatever wire you attach to the positive on the amp goes to the positive on the sub same thing for negative

 

[AnthonyO]

I usually use the copper side for positive and the silver side for negative. Just so I know myself