Nut slotted for classical 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-6200-00 is a great option to replace or upgrade the nut on your six string classical guitar. It has a flat bottom and is pre-slotted for a quick and simple install. Measure: Length: 52.83mm, Width: 5.97mm, Height: 10.39mm, E to E: 43.10mm. Colour: Black