Daddario NW070 Single String

I am using this o string on my 7 string and 8 string guitar. I normally tune it to low B on the 7string, but sometimes I use drop A, F# and drop E. Handles all the tunings without any problems. Fits and sounds perfectly as the lowest string on the regular 8 string guitar.

I saw a review here with someone complaining on the dull sound of this string. This has nothing to do with the string folks. If you have cheap pickups, you will get cheap sound.
I use DiMarzio Activators and EMG active pickups, and this string sounds absolutely killer. In addition, I use brass nut on my 8 string. If you have cheap plastic instead of brass/metal or graphite on your nut, the string will probably sound dull as well...

Great for drop tunings and for the low F# on the 8 string guitar as well.

Highly recommended.

At first I was not very happy with these strings... They sounded pretty dull to me. But then D'Addario started to ship these in a sealed packages instead of a regular paper envelopes, and this improved the tone I can get with these strings far beyond my expectations. For the price, they are the absolute best single strings available. They have a moderate "absolutely fresh tone" lifespan, but after it's gone, they are still very useable, and provide a good range of harmonics.

I highly recommend these strings to anyone who wants to make their own custum gauge string set.