La Bella's Phosphor Bronze sets are made with our exclusively formulated bronze and tin alloy, producing a brighter tone and longer string life than any other phosphor bronze set on the market. Since its introduction in the 1970s, the Phosphor Bronze Series has become our most popular acoustic set for all genres of music.- Brightest tone and longest string life of any other phosphor bronze set- Tension: Light- String Gauges: .012, .016, .022W, .031, .041, .052- Made in the USA with American Wire- Packaged using MAP Technology (Modified Atmosphere Packaging) to prevent tarnishing and ensure freshness