DR Strings flat wound Hi-Beam stainless steel bass strings are constructed upon a round core 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 warm and renowned for durability, unusually long life, consistency, and string-to-string balance. They don"t eat your frets. Medium, 4 strings, 45-105.