Staedtler Mars Micro 250 Mechanical Pencil Leads - Gradation\ Hardness - HB - Length - 60 mm - Line Width - 1.3 MM - Pack of -12. Mechanical pencil lead for use on paper and drawing card. High break resistance due to flexible lead; Smooth-gliding lead, jet black lines. Manufacturing process without PVC - more than 90% based on natural raw materials. 12 leads per tube (6 leads at 1.3 mm line width); ISO colour coding