Andrea Sanctus Cello Rosin (Andrea recently renamed Cecilia)
Cremona in America describes the Sanctus Rosin as follows:
"Initially introduced as CiA’s 10th Anniversary Special in 2018. Two rosin formulas with different properties in one unique block. The outer ring formula gives a silky smooth bowing experience with a focused sound on the strings. The center formula kicks in when the player demands more power and gutsiness from their instrument.''