These came in the 4 wheeler when I bought it. At the elevation I live at, I can tell you this combination hits hard when it kicks in. Definately gives it that "stall" feeling. It was too aggresive for my wife so I put it back to stock.
The spring is .179-.180 diameter and is 4.1-4.3 inches tall. The picture shows it next to a blue spring, which is closer to a stock (or may be a stock spring). The blue spring in the picture is not for sale, just the orange and the 10 BH weights (not in picture). I do not know the springs actual brand or how many different models these may fit.
30.00 obo plus shipping