STAEDTLER® Mars® micro carbonMechanical pencil leads:- 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.- Easy "12-a-go" refilling for Mars micro 775, graphite 760 and graphite 779 05/07.- Up to 7 degrees: 2B, B, HB, F, H, 2H, 3H.- 5 line widths: 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm and 1.3 mm.- 12 leads per tube (1.3 mm: 6 leads). Features Quantity 12 Thickness 0.7 mm Hardness HB