Once the final shape has been completed, the pen must then be sanded through a series of progressive grits. Typically, this means sanding with grits 180, 220, 320, 400, 600, 800, 1200 dry grits. This video shows how this is performed with a single 180 grit paper. Once completed, the next finer grit is used. Do not skip any grits. Also, the next video shows cross sanding, which also performed for each grit.