Rotring 600 Black 0.5mm Parker Jotter Core Line 0.5mm Dr. Grip 0.5mm Orenz Nero 0.5mm Staedtler Hexagonal 0.5mm Rotring 500 Green 0.5mm Rotring 600 3-in-1 Rotring 500 and Orenz at have been used with an eraser a little. The Staedtler does not have a guide pipe. Dr. Grip has no knock cap, and the other pens have no particular problems. Not for individual sale. Rotring 600, 500, Hexagonal, Parker, with boxes.