Click or scroll to zoom Tap or pinch to zoom D'Addario EJ74 Phosphor Bronze Mandolin Strings Medium 11-40 by D'Addario $10.40 SKU EJ74 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart EJ74 is the world's most popular Phosphor Bronze mandolin set. Since D'Addario introduced Phosphor Bronze guitar strings in 1974, they have been synonymous with warm and well-balanced acoustic tone.