600L Phosphor Bronze : The best uncoated string. Note the adjective.

Bought a pack, and tried them out on my Collings OM2H. I usually use Elixirs and love their slippery feel. This is not the string for that. When new, they had the the best tone I could imagine from a string.Also I could get right hand dynamics out of this string (really dig into them) with an ease unlike whatever string I used prior to it. They remain uncoated though, so for me, the fun only lasts for a couple weeks, then they become grimey and sticky due to corrosion. While not the string I would use on a regular basis (more as a one-off for recordings), I very much recommend this product if you are a serious acoustic guitar player that relies mostly on their right hand dynamics: for anything except string life and left hand slipping, this string is - in my humble opinion - close to perfection.