Guitar/Bass Nut. Features: Nut is impregnated with PTFE which is five times more slippery than graphite. Brings out the hidden harmonics of your guitar all while drastically improving tuning performance. Nut is consistent from piece to piece, and within each piece, to offer you harmonically rich tones without the problems associated with natural materials. Dimensions (L x W x H): 63.5 x 6.35 x 11.1 mm. Colour: Black.