Mechanical drafting pencils with the lead weight and clutch we hadn't found at the price we wanted. Lead refills that don't snap. The 71-piece kit that ships with the bundle most of our customers ask about by name.
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When GJ designed the first Leda sketchbook, he tested it with the mechanical pencils in his studio. Most of them, he didn't trust. The ones he did trust were too expensive, or too thin, or shipped with leads that snapped.
So we made our own. Heavier in the hand than most. Single-clutch holders that don't slip. Refill leads sourced from a Japanese mill that supplies the pencils we'd actually own. The Olympian 5B is the one GJ keeps clipped inside his Leda book.