That may be-no real way to tell. I am told linen has no stretch and linen was on the scene before B 50 and there are lots of bows still shootable from the era prior to Dacron. Also, there are lots of 50's bows being shot with the latest strings and no ill effects. Many people in the know-like Rod Jenkins, agree they have never seen a string that could be blamed for damaging a bow. And other so called authorities disagree. No disrespect towards anyone here; it is not cut and dried. Personally I have been using a D97 string on a '59 grizzly for over a year-bow stays strong and gets shot every few days. Not making recommendations, and I would not do that with my Kodiaks.