New, but B-Stock (dings on top by the bridge) A perennial favorite in the Elderly showroom, the KM-150 is a well made mandolin at an affordable price. This instrument features a solid German spruce top with f-holes for clean articulation and a crisp, bright tone. Other key features include solid maple back and sides, a high gloss sunburst finish, vintage-inspired bridge and headstock shapes, and a wider 1 1/8" nut.