Black Tusq XL® nuts are based on Graph Tech's highly resonant Tusq man-made ivory, but are impregnated throughout with Teflon® to improve a guitar's tuning performance as well. As the strings move in the slots during bends and tremolo action, the microscopic Teflon (500% more slippery than graphite) helps them return to pitch accurately.
The advanced polymer material is formed under high heat and pressure for uniform density. It's designed to transfer string energy more efficiently, to make guitars come alive with enhanced harmonics, volume and sustain. Final trimming required.