This heavy synthetic oil is perfect for older rotary valves with loose tolerances.
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.