Martin M170 80/20 Bronze Round Wound Extra Light Acoustic Guitar Strings - 4 Pack

M170 80/20 Bronze Round Wound Extra Light Acoustic Guitar Strings - 4 Pack. The Martin M170 80/20 Bronze Round Wound Extra Light acoustic guitar string 4-pack is a great buy for the player looking to stock up and save time and money. The Martin M170 strings employ a composition alloy to give brilliance, clarity and longevity of sound. The bronze winding is ideally suited for making strings that have deep, rich basses and clear, bright trebles. Gauges 10-14-23-30-39-47.