Editorial Review Dulcimer Strings. Made by Roosebeck.The Roosebeck Dulcimer 4 String Set contains 3 plain steel strings and one nickelplated steel wound on steel string. The strings are designed to provide a bright, rich tone. All of the strings have ball ends. The unwound first or D course has double strings tuned in unison.Tuning and String Gauges1:D.012.300Steel2:D.012.300Steel3:A.014.360Steel4:D.022w.560Nickel