ELECTRIC GUITAR STRING SET D'Addario EHR340 Half Rounds Light Top / Heavy Bottom String Set [10-52] (010, 013, 017, 030, 042, 052). Half-Round wound. Half Round Electric Guitar strings are round wound with stainless steel and a precision system then leaves the outer surface smooth and "semi flat." The result is a string with the tonal characteristics of classic wound strings with a smooth feel similar to flat wound strings.