Monster Oil is home to the cleanest synthetic brass lubricants currently on the market. The company was started by 3 professional trumpet players who collaborated with an aerospace lubricant firm. Together, products that were originally used by NASA were reworked until they were perfect for brass instruments. The result is a line of products that are designed to clean, protect and lubricate instruments all at the same time. Our Light Rotor Oil is specifically designed to be applied directly on your rotor. And it has a unique precision tip that prevents it from leaking or breaking. It is extremely long-lasting, smooth, and will protect your instrument from corrosion.