Thickness and colour
Pencil lead:
Thickness of lead, HB, 0.7mm
Colour: graphitegrey
Gel pen:
Thickness of lead, 0.5mm.
Colour: black
Ballpoint Refills:
Flow Fine, ceramic ball with a diameter of 0.8 mm and a line width of 0.5 mm.
Flow Medium, ceramic ball with a diameter of 1.0 mm and a line width of 0.6 mm.
Flow Bold, ceramic ball with a diameter of 1.2 mm and a line width of 0.8 mm.
The line width varies depending on the pressure applied to the writing instrument.
Colours: black and royal blue