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 and impregnated with PTFE, the slipperiest substance on earth, to improve the tuning performance of the guitar. The PQL-4000-00 is a great option to replace and upgrade the nut on just about any guitar.  It is not slotted so this will need to be done.