I am just trying to make sure you do not steer anyone wrong, which you are. All you have to do is google carbon express crossbolts and you can easily see the different varieties and different spines.. Here I will save you the trouble! The fact is, unless one knows the person they are receiving advice from is an expert on the subject the best place for information is from someone in a pro shop, not a message board. That being said, since someone asked, if you are a novice on a subject do not give advise to a person who may believe you know what you are talking about.
https://www.thecrossbowstore.com/Car...olts-s/348.htm