pH-neutral ivory — 6 mm ruled

replaceable eraser under push-cap

The first BLACKBOOK volume features the Berlin based writer CRYE

The faint grid lines guide pen work without crowding finished diagrams

0 mm is the widest chisel pen in Sakura's Pigma Calligraphy line

uni power tank ball point pen 1 0mm Jake pH-neutral ivory — 6 mmThe Power Tank 1. 0 mm uses the same internal air pressurization system as the rest of the line, keeping steady forward pressure on the ink so it writes smoothly upside down, on slick or oily surfaces, or on paper that's wet through, without skipping or fading out partway through a stroke. The 1. 0 mm tip lays down a thicker, more legible line than the finer size, suited to blueprints, warehouse logs, or field clipboards where the text needs to stand