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Music Nomad’s String Fuel is a hybrid blend of refined naturally occurring oils that are speed blended with premium quality mineral oils to deliver a string cleaner and lubricant unlike any other. The proprietary formulation allows you to both clean and protect your strings, making them last longer and sound better while reducing finger noise and enhancing the speed you can slide your fingers. It is silicone free and safe for any finish, and it even conditions unfinished fretboard wood. Includes the String Fuel solution in a no-mess ergonomic applicator and a microfiber cloth that conveniently stores inside the applicator handle plus after many uses re-fuel the applicator with the String Fuel Refill bottle that is included. The Refill bottle can re-fuel a dry applicator pad at least two times.