public InstrumentsSpec(Model_Enum model, Builder_Enum builder, Type_Enum type, Wood_Enum topWood, Wood_Enum backWood)
 {
     this.model    = model;
     this.builder  = builder;
     this.type     = type;
     this.topWood  = topWood;
     this.backWood = backWood;
 }
 public PianoSpec(Model_Enum model, Builder_Enum builder, Type_Enum type, Wood_Enum topWood, Wood_Enum backWood, Style_Enum style) : base(model, builder, type, topWood, backWood)
 {
     this.style = style;
 }
 public GuitarSpec(Model_Enum model, Builder_Enum builder, Type_Enum type, Wood_Enum topWood, Wood_Enum backWood, String_Enum numString) : base(model, builder, type, topWood, backWood)
 {
     this.numString = numString;
 }