Well one thing is that all springs from different manufacturers have a very different feel based on the size of the coil and other factors. That said, the color coding sounds similar to Balanced Body springs, so I would assume a Red spring. This is purely a guess since I can't feel the springs out, but based on my prior experience using both Classical and more contemporary apparatus. I hope that helps :)
Brilliant! I can't tell you how grateful I am for this advanced lesson. There are a lot of exercises I haven't had the clients to teach to. And now that I do it's nice to having a live handbook to refresh and polish up the cueing. I need to now check out all of your videos on Pilates Anytime. Thanks a million Sharon! You are a great teacher!!!!!