A standard medium viscosity (thickness) oil that is well suited for most instruments, especially those of contemporary build and wear. New and improved, Berp BioOil is made from sustainably grown sugarcane. The oil is plant-based, non-toxic, petroleum free and contains essential oil that cleans as it lubricates. The oil is clear and will not thicken or become gummy or sticky with age. This medium weight oil has a viscosity (cSt rating) of 3.7, which is somewhat lighter than the old BioOil "light" formulation. 1 oz bottle. Made in USA.