DR Strings Hi-Beam - Stainless Steel Round Core Medium 6 String 30-130 Hi-Beam stainless steel bass strings are round wound and constructed upon a round core, which is unique in the industry Hi-Beams require much more time, care, and extra steps to make than other bass strings The extra effort DR expends making Hi-Beams results in a bass string that is highly flexible, musically bright (not harshly bright) and renowned for durability, unusually long life, consistency, and string-to-string balance They don't eat your frets