Set VSA1050 Acoustic Guitar Extra Light Phosphor Bronze 010/014/020/028/038/050. La Bella Vapor Shield strings are unlike any other type of strings. Their extreme durability is achieved not through a coating, but through a highly complex alteration of the surface via vapor deposition with a special polymer. This process is extremely time-consuming, as the strings are not sprayed or dipped. The usual disadvantages of a coating are a thing of the past with Vapor Shield strings. La Bella's arguments: - 5x longer durability than untreated strings - brighter sound compared to coated and regular strings - balanced tone, as the plain strings are also treated - very pleasant surface on all strings - extremely durable even with intense, long playing - perfect protection against sweat, dirt, tarnishing, etc.