Music Nomad's TUNE-IT is your personal guitar tech to stay in tune longer & reduce string breakage. This pro strength biodegradable formulation is like no other & contains anti-wear, anti oxidants & anti corrosion additives fortified with PTFE. Odorless, non-staining & silicone free. Apply to Nut Slot, Bridge, Saddle and String Guides every string change. Most importantly, it does not affect the sound or sustain of the strings. Great for moving parts, such as open tuners & tremolo bars. A little goes a long way to help you sound the best.