3 mm technical line and a 1

Apply it with a brush

Checker 170

so finished lettering holds up over time without yellowing or running if it gets wet

moleskine classic pocket notebook hard cover squared Boner 3 mm technical line andA pocket sized 5 x 5 mm graph grid hardcover notebook for engineers, financial analysts, and software developers who need precise geometric structure for wireframes, data plots, and code blocks on the move. The rigid black hardcover protects technical layouts during daily carry 192 ivory pages, 70 g m acid free paper, thread bound flat lay construction. Format: Pocket A6 equivalent (9 x 14 cm) 192 pages 5 x 5 mm squared grid 70 g m ivory, acid free