Fine leads for paper and drawing cardboard. Easy refilling with "12 in one go" for Mars micro, graphite 760, graphite 771, and graphite 779. Features a smoothly gliding lead for a rich stroke. Exceptionally elastic and particularly break-resistant. Good erasability. Marked with ISO color codes. Suitable for all mechanical pencils. Available in up to 7 degrees of hardness and 5 line widths: 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, and 1.3 mm. The lead container simply snaps on, allowing the entire contents to be filled into the Mars micro, graphite 760 and graphite 779 mechanical pencils at once. Advantages: No handling of the lead, lead does not fall out, lead does not break. The identical color coding for mechanical pencils, fine leads, and ink pens facilitates the visual identification of line widths. STAEDTLER operates in an ecological and efficient manner! Efficient and environmentally friendly - that’s the idea!.