Professional Silver: This strings are created from the same exclusive silver plate alloy as the 10PH but are offered in a traditional tension to yield the most powerful tone from smaller guitars with shorter string scale(+or-65cm). These very sentitive strings are also the perfect choice for those with older, more delicate instruments.
Flamenco Strings: The only nylon guitar strings designed for the flamenco players. Designed to reproduce with little finger pressure extreme brilliant and beautiful tones.

Bass Strings: Silverplated in all models.
Treble Strings: Plain White Nylon in the professional.Red Nylon in the flamenco.