La Bella VSE942 Vapor Shield Electric Guitar Strings, Extra Light, 9-42 String Gauges: . 009, . 011, . 016, . 024W, . 032, . 042; Tension: Extra Light Phosphor Bronze Wound & Plain Steel treated with Ionic Vapor Process Slick mutated surface is resistant to oil and grime Made in the USA with American Wire Packaged using MAP Technology (Modified Atmosphere Packaging) to prevent tarnishing and ensure freshness