RS Berkeley Piccolo Cork Grease 2 Pack Package includes cork grease 2 pack. Cork grease: RS Berkeley Premium Cork Grease is ideal for students of all levels & professionals. This high quality lubricant for corks and flute head joints is essential to keeping your instrument performing at its highest level. The blend of ingredients will prevent your corks from drying out and allow your cork to retain its natural structure. This lipstick style twist tube allows application without the cork grease contacting your fingers. RS Berkeley Musical products are endorsed by numerous leading players and repair techs and used by beginners, pros, & educators alike.