Designed to boost guitar performance, the TUSQ XL Fender-Style Slotted Nut - Aged White 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 Teflon to improve the tuning performance of your guitar. 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.