The Graph Tech TUSQ Martin Style Nut Blank allows you to cut custom string slot sizes and spacings for Martin guitars with their angled bottom nut slots. The TUSQ material is efficient at transferring vibrations to your guitar and delivers a rich tone with crystal clear bell like high-end with big open lows and increased sustain, as a man-made material it is consistent from piece to piece with no hidden soft spots associated with bone. Graph Tech nuts are supplied slightly oversized to allow for final fit and shaping.