The Jimi Hendrix Pure Nickels were one of my favorite pure nickel strings, just behind the more expensive Pyramid Classics. They also were round core, which is the only kind of string I now play. I have tried to get Markley to put out some version of the Hendrix Pure Nickels, but the idiot that answered my email didn't even understand his own string line, he told me to just get the Vintage Reissue strings (round core but NPS wound, they are great and I use them on some guitars, but like the pure nickel wound on other guitars). So I bought about a dozen sets of the Hendrix strings when they discontinued them, then I guess it's back to DR Pure Blues (also pure nickel on round core), or put out more money for the awesome Pyramid Classics.
Al