Interesting. I've read numerous times that they are stainless. I think there is a typo on their website, as the Neons are a coated string. And this was sent from Shawn at DR (Black Beauties and Neons are the same string with different color):
"The new K3 coating is far superior to the old coating we previously used, as that coating was outsourced. Now everything is done in-house and the results are truly amazing! The Black Beauties for bass are similar in construction to the HiBeams, as they are on a roundcore string.I really do believe you will be pleasantly surprised at how natural the strings feel with the coating. If you have any further questions, please feel free to contact me via e-mail. Thanks so much!"
And from Ed Friedland:
The Extra Life strings have a round core and start with a stainless wrap wire, so tension-wise they were on par with the Hi-Beams and Fat Beams.
Maybe someone from DR will clear this up?