The PT-4202-00 is the perfect option to replace and upgrade the nut on just about any guitar or bass. It is ?3/16" thick rounded blank that only needs final fit and slotting. TUSQ delivers a rich tone, crystal clear bell like high end with big open lows and a significant increase in harmonic content and harmonic sustain.Increase harmonics equals more richness and character in your tone. Its the difference between a four piece choir and a twelve piece choir singing every time your play a note. 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.   Please note that all Graph Tech nuts are slightly long and wide to ensure extra room to achieve a perfect fit for your guitar. This extra material can easily removed with fine grit sandpaper.