Dean also imports and markets other string instruments such as resonator guitars, mandolins and banjos. Its other resonator instruments include a 12-string guitar, ukuleles and mandolins. Jay Turser produces guitars, basses, mandolins and banjos in a variety of models. National also produced resonator ukuleles and resonator mandolins. It is a common tool for players of guitars, mandolins, mandolas, banjos, ukuleles and bouzoukis. Johnson has also produced resonator ukuleles and mandolins. Apart from guitars, the company currently produces acoustic basses, mandolins and ukuleles. Some instrument strings for acoustic guitars, mandolins and violins are wrapped with phosphor bronze. The guitar players double on ukulele, mandolins, electric guitars, and acoustic guitars. All-fifths tuning is typically used for mandolins, cellos, violas, and violins. Instruments used commonly include lap harps, mandolins, whistles, bag pipes, and guitars. Lloyd Loar worked briefly for the Gibson Guitar Corporation making mandolins and guitars. Washburn Guitars is an American manufacturer and importer of guitars, mandolins, and other string instruments. Traditional Italian mandolins, such as the Neapolitan mandolin, meet the necked bowl description. A handful of contemporary luthiers build piccolo mandolins.