Andrea/ Cecilia Sanctus RosinThe Andrea Cecilia Sanctus rosin contains a ground breaking combination of a hard outer ring for smooth bowing and a soft inner ring for a powerful sound. This rosin has been formulated to provide more possibilities in the sound of stringed instruments. This unique combination of two sophisticated rosin formulas provides the optimum balance for sound and bow control. These formulas have been put into two separate areas in one special rosin cake to