The rOtring Isograph Technical Pen was designed and manufactured with precision for optimum performance. The hard chrome-plated thin tip is wear-resistant and allows for delicate details. Featuring a push-on sleeve for easy access to the ink helix and for fast cleaning when needed. The ink level is visible and the refillable ink reservoir is ideal for frequent drawers. rOtring isograph technical pens have a colour-coded barrel that indicates line width for easy identification.