The Roosebeck Dulcimer 4 String Set contains 3 plain steel strings and one nickel plated steel wound on steel string. The strings are designed to provide a bright, rich tone. All of the strings have loop ends. The unwound first or D course has double strings tuned in unison. Tuning and String Gauges 1:D .012 .300 Steel 2:D .012 .300 Steel 3:A .014 .360 Steel 4:D .022w .560 Nickel