This is one of the most important tools in the drawing. It comes in various grades. The grade of a pencil to be used depends on the quality of the paper to be used. You must take into consideration also the type of line work required. Hard pencils are used where extreme accuracy is required especially working on graphs, diagrams, and charts. Medium pencils are used for general purpose work in drawing and Soft pencils are too soft to be used in mechanical drafting. They are very useful for the artwork of various kinds.