The Banjira Indian Santoor String Set consists of looped end strings with the following diameters and materials: String IN mm Material 1-2 0.028w 0.711 Bronze 3-4 0.024w 0.610 Bronze 5-11 0.018 0.457 Steel 12-18 0.016 0.406 Steel 19-24 0.012 0.305 Steel 25-31 0.009 0.229 Steel