Description Specifications Black TUSQ XL is engineered from the same material as TUSQ and is impregnated with PTFE which is five times more slippery than graphite. It has all the tonal benefits of TUSQ, bringing out the hidden harmonics of your guitar all while drastically improving tuning performance. Black TUSQ XL is consistent from piece to piece, and within each piece, to offer you harmonically rich tones without the problems associated with natural materials. Consistent quality Impregnated with PTFE Black in color Increased harmonic content Improved tuning Precision slotted products.brand Graphtech UPC: 702725120543 Product Reviews 5 Really Good Posted by Paulbee on 17th Sep 2019 Sounds really great, easy install, stable tuning, intonation holds true whilst setting up. Black looks nice on rosewood.