Two of these are fine, they read around 8 ohms, no rub. The other two read open and as such do not work. They can be reconed or perhaps the tensile lead to former has gone open and maybe they can be resuscitated, but consider that you are purchasing four of them that only two are good. 

There are no returns, they are sold as is, as listed for parts with two working and two not working. 

Please feel free to ask any questions you may have. 

Buyer pays shipping.