Funny! Someone said coldwound will shorten over time and can actually collapse. Hotwound retain their starting length. I'm sure you can't "tell" the difference except it will eventually affect pre-load. The phone number listed here works, but they are cheaper from FRP. That's who I'll go with. Brad at Lowe could not answer my question right off? Lowe's price was like $80 and FRP is $69. Anyway I decided I was being anal about it and am going to get the FRP's regardless.