LaBella 2001M Classic Medium Tension Nylon 202 trebles produce greater aural transparency and sound projectionSilver-plated wound basses produce exceptional memory for pitch and consistent sound productionMedium tensionMade in the USA with American wirePackaged using MAP Technology (Modified Atmosphere Packaging) to prevent tarnishing and ensure freshness Silver-plated wound basses 285-35-415 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