A light viscosity oil that is well suited for horns with newer valves or tight valves. 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 Light oil has a viscosity (cSt rating) of 2.2, which is among the lightest available and is significantly lighter than Berp's previous Light BioOil. 8 oz studio bottle. Made in USA.