STV15012 Scott Cao Student violin outfit 1/2 RV-812 Rudolph Étude violin 1/2 Stradivari model RV-1012/O Rudolph Étude violin outfit 1/2 RV-1512 Rudolph Conservatoire violin 1/2 LV-1012 Leonardo Basic series violin outfit 1/2 LV-1512 Leonardo Basic series violin outfit 1/2 LV-1612 Leonardo Basic series violin outfit 1/2 LV-1812 Leonardo Basic series violin outfit 1/2 LV-2012 Leonardo Student series violin outfit 1/2 LV-5012 Leonardo Maestro series violin outfit 1/2