Nut slotted for acoustic or electric guitar. 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. The PT-6143-00 is the perfect option to replace and upgrade the nut on your acoustic or electric guitar.  It is pre-slotted to make for a quick and easy install. Measure: Length: 43mm, Width: 6mm, Height: 8,88mm, E to E: 35mm. Colour: Black