Roche-Thomas Premium line of lubricants are formulated and bottled in our facilities using a special filtering process that eliminates impurities and residue. Our unique process insures that you receive a fast acting lubricant with a clean coat which is virtually dust and lint free. Our premium key oil is a superior blend and won't harm your instrument. Key oil by design is a heavier oil then valve\slide oil, and is a clear oil with no dies or additives. Priced right for all musicians; formulated for the professionals. Our premium key oil comes in a 2oz cylinder bottle with a leak proof one piece cap that has a controlled dropper tip. Here at Roche-Thomas we are proud to say that ALL aspects of our products are manufactured in the USA so you know you are purchasing the finest products on the market.