Extremely flexible, 2001 Medium Tension strings are responsive and sensitive to the slightest left hand vibrato and subtle tonal changes produced by the right hand. They combine a high performance capability with a tremendous ease of playing. The 2001 Series Classical Guitar Strings are the product of years of intense research and development. During the formulation of the 2001 Series, prototypes were tested worldwide by fine performing artists and teachers. These guitarists expressed a need for classical guitar strings with a greater response, clarity and sustaining power. To meet this demand, La Bella redesigned both the treble and bass strings according to new specifications. Nylon 202 trebles produced greater aural transparency and sound projection Silver-Plated wound basses produce exceptional memory for pitch and consistent sound production Made in the USA with American Wire Packaged using MAP Technology (Modified Atmosphere Packaging) to prevent tarnishing and ensure freshness.