Description from Woodbrass :
Ultra-Pure ULTRA-LIGHT valve oil is made for the closest tolerance valves. It is lighter in weight than our Professional valve oil and will make your valves feel faster and lighter. Works well on all brands of instruments and especially on very tight valves which can stick with other valve oils (especially Yamaha, CarolBrass, and Schilke). Perfect also for the Thayer axial-flow valves of some trombone triggers. Non-toxic, synthetic, odorless, long-lasting. Ultra-Pure Ultra-Light valve oil has a lower freeze point compared to Ultra-Pure Professional valve oil, and is the best choice for sub-zero temperatures (down to about 9F or -12C). We now offer Ultra-Pure Professional Valve Oil and Ultra-Pure Ultra-Light Valve Oil in child-safety packaging as required in the US and Europe.