The blue part of the combi 526 508 eraser is specifically designed for erasing India ink on special drafting film or transparent paper. It contains a solvent that dissolves the ink, making it easier to erase. T
and once you’re in that space there are many competitors. The Norica is about the most I’d spend on a general-use wood pencil that might at times be abused and even damaged in the workshop. I do have some drawing-style pencils, but they’re dedicated to drafting use...