Selmer Accordion Accessory (337RC) An easy to use one step trombone slide lubricant rapid comfort is designed for the trombonist who wants the features of Slide-O-Mix, but in a quicker and easier application Rapid comfort can be used when there is limited time for application A quick and reliable solution in one! Apply it, spread it, and you're ready to go!! Slide-O-Mix Rapid Comfort is an easy to use one step trombone slide lubricant Designed for the player who wants the features of Slide-O-Mix, but in a quicker and easier application