The PT-6010-00 is a great option to upgrade the nut on your Gibson USA guitar.  It has a flat bottom and is pre-slotted for a quick and simple install. One of the key causes of tuning frustration is string binding at the nut.  Black TUSQ XL is impregnated with PTFE, the slipperiest substance on earth and alleviates the binding grip the nut has on the strings.  Strings simply glide back into tune! 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      Measure  Length Width  Height  E to E   inches 1.735"  0.196"  0.366" 1.425"  inches 1 3/4" 3/16" 3/8" 1 7/16" millimeters 44.07mm 4.98mm 9.30mm  36.20mm   Note: All Graph Tech nuts and saddles are slightly long and wide to ensure extra room to achieve a perfect fit for your guitar. This extra material can easily be removed with fine grit sandpaper. Click here for the installation instructions and click here for 'how to measure your nut' HOW DOES IT SOUND? With Black TUSQ XL you will hear more richness from every note you play.  Engineered from the same material as our highly esteemed TUSQ, it has all the tonal benefits, bringing out the hidden harmonics by transferring your strings vibrations efficiently to the guitar.  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.