a variety of materials used to make peanut guitar are: plastic, bone, brass and graphite, and most guitarists tend to prefer guitar nut made of bone material
Making a nut from scratch is a tall order requiring an experienced guitar tech and about an hour or so of their time. The job also calls for several special tools such as precision nut files, razor saw, small wood chisels, etc. But for those of you who want to learn how to do it yourself there are a variety of "how - to" books that can help you out. A great one is the "Guitar Player Repair Guide" by Dan Erlewine. As well as a detailed step by step explanation, there's a list of the tools you'll need and how to get them.
Source : cleverjoe.com
Image Source : guitarfetish.com
Image Source : guitarfetish.com