-Mechanical pencil lead for use on paper and drawing card. -Smooth-gliding lead. -Jet black lines. -Highly flexible - extremely break-resistant. -Easy to erase. -ISO colour coding. -Suitable for use with all mechanical pencils.-12 leads per tube (1.3 mm: 6 leads).-Easy "12-a-go" refilling for Mars micro 775, graphite 779 05/07 and graphite 760.-Up to 7 degrees: 2B, B, HB, F, H, 2H, 3H. -Available in 5 line widths: 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm and 1.3 mm.12-a-goThe neck of the lead tube is simply inserted into the end of the mechanical pencil - all twelve leads can be filled into graphite 760, Mars micro 775 or graphite 779 in one go!Advantages:-No touching of lead.-No dropping of lead.-No breaking of lead.ISO colour coding The identical colour coding of mechanical pencils, mechanical pencil leads and technical pens facilitates recognition of the different line widths. efficient for ecologySTAEDTLER® acts ecologically and efficiently at the same time! Efficient and environmentally saf