Here's a HAND MADE nut made from genuine aged bone- not bleached white- Nothing beats bone for ultimate tone or sustain. This is 42mm wide and 3.4mm thick- so please measure your guitar BEFORE ordering. These are flat-bottomed to fit most imports- and of course you can simply file the correct radius into the bottom to fit on any USA spec guitar. With bone it's quite easy! This is real bison bone- which is very dense and has a nice "aged" patina to it. As with ANY guitar nut a substantial amount of hand fitting is often required, and even though the slots are molded you will need to hand-file the slots to meet your particular playing requirements.