Fine leads for paper and drawing board. 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 code. Compatible with 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 touching 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 matching of line widths. STAEDTLER operates both ecologically and efficiently! Efficient and environmentally friendly - that is the idea!.