Graph Tech Tusq XL Strat/Tele Style Slotted Nut PQL-5000-00
Designed to boost guitar performance, TUSQ XL is precision engineered and specially formulated to bring out the hidden harmonics and richness in every note. TUSQ XL is based on the highly resonant TUSQ man made ivory, but impregnated with PTFE to improve the tuning performance of the guitar.
Other nut materials have a tendency to bind the strings in their slots. When you are tuning your guitar you might hear the tell tale "ping" of the strings releasing under tension or have difficulty keeping your guitar in tune when using a tremolo or doing string bends.
There are many temporary solutions to this problem, but wouldn't you rather a permanent one? TUSQ XL has PTFE lubrication impregnated all the way through the material (PTFE is the slipperiest substance on earth...500 times more slippery than graphite.), so you never have to worry about string binding at the nut again.
TUSQ XL will bring out hidden harmonics in your guitar. The highly resonant material couples your strings' vibration to the neck better than anything else. You will hear more richness from every note, especially on open strings.