Just took them out of my front end. No markings on them but they are slightly thicker wire than the .85 RaceTechs I replaced them with and they were a bit stiffer. They are also straight wound springs like the RTs. The previous owner was over 200lbs and had an Eibach 900 rear spring as well.
I weigh 160+ so if you're in the 190-220 range, these will work for you.
$50 shipped with the spacer tube and washers Racetech sent me.