The Fender 150L strings are designed to give vintage blues and rock tone, combined with modern manufacturing standards. The ball ends of the strings are colour coded. These are pure nickel strings. Fender designed them for use in the blues, jazz and classic rock genres, although anything goes and I certainly do not fit into any of those categories. I have been using 009 gauge strings since the 1970s and have previously also used Ernie Ball, Gibson and Rotosound in particular. The Fender 150L seem to suit me well and they have an uncovered third string. I play very lightly with a nylon plectrum half a millimetre wide at the tip. With modern equipment, you only need to tickle the strings anyway, though many people can be heavy handed. These work well in tremolo systems like on a Strat, but I have not tried them in a Floyd Rose fitted guitar.