Super Sensitive Red Label 8137 Bass D String, Regular 3/4 Since 1930, Super-Sensitive "Red Label" strings have been the choice of students and professionals alike Designed with the student in mind, Red Label strings are favored and recommended by Suzuki Method instructors, school and private music teachers, students and professionals Red Label strings are full-core, nickel-wound strings that provide excellent tonal quality and dependability at an affordable price