We have found Dyna Flight10 to be one of the best materials for string making we've ever used. It decreases our stretch time and our customers love ther results. We built with Astro Flight for quite a long time and made the switch to Dyna Flight10 because in our experience we had better results with this material. We love the composition, it makes a lighter, faster, quieter string in our experience and we are extremely happy with the BCY customer service. I would highly recommend to anyone wondering what the difference is to try it out for themselves.