Handmade wood mechanical pencil. The wood is black walnut and it is sanded super smooth from 60 grit to 12,000 grit sand paper and is finished with friction polish in order to protect the wood and give a nice smooth finish. Other than being handmade it functions like a normal mechanical pencil and it has a built in pencil sharpener and eraser. In order to put in replacement lead you pull off the eraser and built in sharpener and put the lead in manually. The pencil comes with 2 cases that contain 12 replacement pieces each. The lead comes from Mr Pen inc on Amazon. The lead size is 2.0 mm by 90 mm. Thanks for viewing my product enjoy!!