From the manufacturer:
StarBrite Fallen Sky is a blue-ish green color mixed by the late Scott Marshall, Ink Master 4 Winner and Pro-Team artist.
This is one of his favorite colors out of the series. It works great with Murky Tomb and Ancient Slate.
This color makes for a really cool under lighting on any portrait or bio piece.
You can also do a duo tone, opaque black and grey with this line up
Gauge Size
The gauge size is the circumference of the smaller bar in the middle.