Morning glory Flat Lead 1.8 mm Holder Pen Mechanical Pencil for Draft Drawing, Art Sketching/Calligraphy/Marking (1.8 mm 2B Lead 6 Tube-36 Leads) Graphite Lead Refill Filling out mark sheets easily due to flat square-shaped leads Also great for writing, Calligraphy,Marking, drawing and sketching Lead: 1.8 mm x 60 mm (1 Tube 6 Lead -Total 36 Leads)