Junior Isograph Set 3+1 Isograph offers exceptional precision and allows for work in fine detail. The clever push-on sleeve allows for quick and simple cleaning and easy access to the ink helix. Thin stainless steel nib for extended use and the highest level of precision available. reusable ink container. available with thirteen distinct line widths. to be used on a range of surfaces, including vellum drawing paper, tracing paper, and line boards. Included are three isograph pens. Burgundy Tikky Mechanical Pencil, 0.5 in. Four ink cartridges.