This Elixer article is a good resource. Another similar product is D’Addario’s EXP series strings. D’Addario coats the winding wire instead of the entire wound string. The coated winding wire is then wrapped around the core string. D’Addario claims that this method allows for a brighter, less damped sound than the method used with the Elixer’s.

Although, I haven’t personally compared them, D’Addario’s process is obviously more extensive and expensive than simply coating the entire finished string. And since D’Addario is the OEM for many string brands, it’s also certainly worth checking out the EXP’s in addition to Elixer’s.

Cheers!
jp