The legendary Les Paul worked with us to develop these strings. They are wound with pure nickel for a smooth warm tone that delivers a punch when you need it. To ensure the least amount of ambient noise possible, Les Paul specified the additional detail of silk-wrapped ends. The result is a truly vintage tone with studio-quiet performance. Just like Gibson instruments, authentic Gibson strings are American made, world played. And, like our instruments, our genuine strings utilize strict quality control methods to ensure tone, durability and consistency. All Gibson strings feature specs absolutely unique to Gibson and are factory sealed to guarantee freshness in every set.