Ernie Ball Slinky strings are used by legends around the world, such as Jimmy Page, Metallica, Eric Clapton, Slash, etc. Get the best of both worlds - a Skinny Top (E, B, G) string for enhanced shreddability and a Heavy Bottom (D, A, E) string for thicker chords and rhythm. Element Shield packaging preserves the quality of the strings so they retain the same properties as during production. Clear and balanced sound. Made in the USA, California, with the finest materials.