I have been shooting Extreme Bowstrings now for sometime. If you are in the market for a bowstring, give em a look. You will not be disappointed. Every string I have received has been immaculate and dead nuts on measurements. Couple weeks ago I ordered a string from him. There was a question on what I wanted and he called me to make sure we were on the same page. 3 days later I received the string and it was perfect. Exactly what I wanted. Put it on my Halon X, tuned it, and the difference was unreal. My first round of 60 was a 300/44X followed up with a 299/41X. I have been away from Archery for about 2-3 years due to an injury, and just came back in December. Once I put his string on my new bow, my accuracy improved amazingly. My 16 year old son bought a Chill and I set it up and tuned it for him. He was averaging a 285-290. I replaced his sting with one from Extreme and his first round shot a 299/39 (dropped an arrow in last round due to nerves, would have been his first 300). I have have never been disappointed with an Extreme bowstring. If you are looking for a new set of threads, do yourself a favor and check them out. You won't be disappointed, Ron does an incredible job and your bow will appreciate it. 

https://www.extremebowstrings.com