D`Addario Helicore viola SET up … D`Addario Helicore viola SET, extra long scale 17" and over Item No. HL410X Manufacturer D`Addario D`Addario Helicore viola A D'Addario Helicore viola SET, extra long scale 17" and over × D`Addario Helicore viola SET, extra long scale 17" and over