Tenor Guitar. Silver-Plated with Ball-Ends. La Bella's Silver-Plated sets are made with silver-plated copper wire, hand-wound; steel core. First introduced; La Bella; the 1940s, this traditional style; string has slightly less tension than bronze; brass wound strings; result, our Silver-Plated strings produce; uniquely clean and crisp tone; Clean and crisp tone Specifically made for Tenor Guitars using steel strings tuned; String Gauges: .009, .013P, .020W, .027 Made in the USA with American Wire Packaged using MAP Technology (Modified Atmosphere Packaging); prevent tarnishing and ensure freshness.