This is stuff that should lubricate your guitar nut to make strings glide over easier and also prevent string breakage. Even improved tuning stability is mentioned. Well, on my experiences it might help a bit on tuning stability, especially if you have a worn nut. But there is a kind of snake oil feeling about this product, it is kind of hard to say does it do anything at all.
Best thing about it:Included applying syringe gives you rock´n´roll credibility