Thomastik-Infeld Tropics - Bass Thorvaldson Colophane 2000 - Gold&Silver - violin, viola, cello Item No. 9059 Yumba bass rosin – Tango Line… Thorvaldson Colophane 2000 - Gold&Silver - violin, viola, cello × Thorvaldson Colophane 2000 - Gold&Silver - violin, viola, cello