D1 ballpoint pen refills are also known as refills for multi-color pens

Kaweco is one of the few companies to offer the D1 Lead in 3 different line widths. The particularly soft paste provides a special writing experience.

Available line widths are 0.8 mm (fine), 1.0 mm (medium) and 1.2 mm (wide) in blue and black.

Red is available as a "marking lead" for multifunctional devices with 1.0 mm (medium).