Graphite leads, diameter of 2 mm, for mechanical pencils propelling pencils. Its is produced in various hardness degrees: 3B, 4B, 5B, 6B, 7B, 8B. They are suitable for drawing and drafting. Extra soft variations are suitable for artists. Depending on their usage, we distinguish leads for technical, graphical and artistic purposes. One box includes 12 leads of a single hardness degree.