I've been using Ernie Ball strings for years, and had the chance to go through many different sets for various tuning. The most recent change was to Drop-B and Drop-A#, and with that came a problem - there was no Ernie Ball set that gave me optimal string tension, something which had to be solved by trying to piece together a custom set on my own.
This set eliminates the need to buy separate strings, making it easier and cheaper to get good quality strings for your guitar!