Gauges 45-56-77-98.

Martin M100 80/20 Acoustic Bass Strings are made from a phosphor bronze composition alloy to give brilliance, clarity, and longevity of sound. The bronze winding is ideally suited for strings that have deep, rich basses and clear, bright trebles.

Martin acoustic bass strings are high quality strings intended for daily use. Martin strings are wound to precise specifications. Core and wrap wires must meet strict requirements in order to make the grade.