DR Strings Hi-Beam - Stainless Steel Round Core 45-100 Gauge: Medium-Light Round wound and constructed on a round core, which is unique in the industry Highly flexible and musically but not harshly bright Renowned for durability, unusually long life, consistency and string-to-string balance They don't eat your frets. HI-BEAMS are the string to choose for brightness, punch and ease of playing