ANDREA "Sanctus" is a unique rosin that combines two separate formulas in a single cake. The main base is hydrogenated for excellent oxidation resistance. The center part is an enhanced formula based on ANDREA's popular "SOLO," and is physically softer and thicker. The outer part is formulated to have a harder and drier texture, which gives a wonderful balance in sound while protecting the softer center rosin. As with all Andrea rosins, this product is hand-poured; made in the USA.