Fast, long-lasting oil with a very silky feel. Microscopic particles of PTFE carry on lubricating long after other valve oils have evaporated. Formulation includes a special anti-evaporation agent and is virtually odourless. It has a special bottle with built-in UV filter to protect from sunlight. This oil is especially useful for tuba and euphonium players as well as trombonists using Thayer and other large valves. No need for constant re-application due to evaporation. Needle for precise application. Also great for woodwind keys.