That used to be a standard Fender set, they recently stopped having that gauge in the regular line and re-introduced it as the Hendrix set, as he was a popular user of that gauge (although others used the same gauge back in the early 60's, it was one of the only rock gauges around back then). Other companies also make that gauge, I think DR might, and I know that you can get 10-38 Pyramid Classics.
Al