And finally there's the Super Vee Superglide nut-slot lubricant, have you ever noticed how sometimes when you're tuning the strings on your guitar, there's a slight "Tink" sound, or that the string seems difficult to tune up to pitch?, well 99% of the time I've found that's caused by the string binding in the nut-slot due to friction, the Super Vee Superglide lubricant is designed to reduce the friction due to binding, all you need to do is put some in each of the nut slots, it pretty much does what graphite from a pencil does.