They are the Boss springs. I bought them new for $129. I posted them for $75 plus shipping. I don't put a lot of miles on my car. I doubt they have 500 miles on them. I think they are around 9 lb. per inch stiffer than the stock springs so ride quality is unaffected. They are a nice design. Significantly smaller and lighter than the stock springs. With no one in the car it sits 1/8" higher in the rear so it levels it perfectly.
I saw you were selling your Steeda rear springs, what are you looking to get out of them? Did you buy them new and which one are they specifically? Thanks!