D'Addario K610 Kaplan Upright Bass String Set, 3/4 Scale, Medium Tension Kaplan double bass strings are aimed at the most discerning orchestral musicians. Kaplan strings offer a rich tonal color palette and superb bowing response in a beautifully balanced set. The set provides clarity and warmth from low to high registers and allows versatility and control throughout the dynamic spectrum. - Medium Tension - Stranded steel core