Dunlop Fretboard 65 Ultimate Lemon Oil to keep it clean, conditioned, and happy. There's nothing worse than a dry, unhappy fretboard on your bass or guitar. Not only does it look sad, but it can also cause harm. Dunlop Fretboard 65 Ultimate Lemon Oil keeps your open-pore freeboards (rosewood, ebony, etc...) happy and healthy. Take care of your instrument with Dunlop Fretboard 65 Ultimate Lemon Oil.