Detail 01
30–130 medium gauge
This set is identified as the medium-gauge Groove Series option.

Independent shopping perspective
Markbass Groove Series 30–130 medium-gauge bass strings use selected nickel-plated steel wire, hand-wound around a hexagonal high-carbon-content core. The series balances calibrated diameter and tension with the traditional warm character associated here with nickel. For a bassist selecting a medium-gauge set by its 30–130 range, these are a focused choice built around that material, core design, and feel-oriented calibration.

Strong match
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
This set is identified as the medium-gauge Groove Series option.
Detail 02
The nickel-plated steel wire is hand-wound around this core.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
It is the 30–130 medium-gauge Groove Series set.
They use selected nickel-plated steel wire wound on a hexagonal high-carbon-content core.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.