The PT-6060-00 is a great option to upgrade the nut on your Epiphone and other popular import guitars.. It has a flat bottom and is pre-slotted for a quick and simple install. 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.This product is not a proper fit for Epiphone guitars manufactured after 2014, as there has been a slight change in their their string slot specs. We have a blank version of this nut (PT-4025-00) as an available substitute while we work on a slotted solution.