Specially formulated, all natural blend of expensive non-toxic exotic oils, antioxidants, and stabilizers, controls the dimensional stability and water balance of fine wood instruments. It really, thoroughly soaks into the wood. Water is both the enemy and the friend of fine wood musical instruments and controlling the water sorption and description of (amount entering and leaving) the wood adds dimensional stability, retards the tendency to crack or split, prevents water logging, and improves the overall tone of the instrument. Your  fine wood instrument should last many years with proper care. Especially good for dry environments - necessary for damp climates. It will also darken your dried out rosewood or ebony fingerboard.