The Mono 100 Pencils from Tombow uses highly condensed graphite lead that allow for smooth, dark, and clear lines. It is the higher end model of the MONO pencil series in terms of its lead, body, and design.
The Mono 100 was released in commemoration of the 55th anniversary of Tonbo Pencil in 1967. The core particles were increased to "10 billion pieces per millimeter cube", consequently leading to the name "Mono100"