The Rainbow finish is a PVD (Physical Vapor Deposition) coating made using a titanium nitride (TiN) base with layers of aluminum titanium nitride (AlTiN) on top which is where the color comes from. The color shifts along the body as the light and viewing angle change. Where the Black Panther DLC goes for stealth, this one is meant to be noticed. Paired with black DLC titanium hardware and offered in Standard and Short lengths.