The Yamaha VVO Vintage Superior Valve Oil is bases on a newly developed synthetic formula that is more consistent than mineral-based oil to provide superior performance in all playing environments. The VVO Vintage Oil is made up of even-sized molecules to allow the oil to evaporate smoothly, guaranteeing a longer life with extremely responsive action. The Vintage Superior Oil is designed for instruments with large valve tolerances, such as vintage or low brass instruments and is the same oil included with all Yamaha Low Brass Instruments. The Yamaha VVO Vintage Superior Valve Oil is available in a 1.28 ounce plastic bottle.