Developed in the 1970s, the Professional Series product line were the first classical guitar and lute sets to be offered in a wide variety of gauges. They have been acclaimed by concert guitarists, lutenists and prominent teachers and even used by such great luthiers as Del Pilar, Rubio, Papazian, Van Lennep and Gurian. The Professional Series have been the preferred strings by a whole generation of great artists including: Laurindo Almeida, Julian Bream, Mario Escudero, Maria Luisa Anido, Sabicas and Rey de la Torre. The Professional Series strings are still the standard for excellence expected by all serious guitarists. No single set of strings can possibly bring out the finest qualities of every type of guitar or best suit the varied technique and styles of every guitarist. This product line offers some distinctive designs to perfectly satisfy the demands of professional concert performers. The 10PH High Tension Silver set has clear high-density nylon trebles and silver-plated wound basses. Designed for the modern concert guitar with a long string scale (65.5 – 66.4cm), these bass strings are wound with a new silver-plated alloy.