Dean Markley Helix HD Phosphor Acoustic Guitar Strings, 13-56, 2088, Medium

Helix strings represent a giant leap forward in the evolution of string technology. Helix's patent-pending Elliptical Winding process brings new life to your music with a smoother feel, and a richer, more resonant tone that is unrivaled by conventional strings. The Hyper-Elliptical compressed winding process allows for an increased number of wraps across the length of the string without altering its diameter, resulting in fuller tone, incredible sustain, and an increased life span. In fact, Helix strings last up to five times longer than other strings!