Light long lasting designed with just the right amount of material for maximum and safe use quality ink quick drying and smooth writing tungsten carbide ball perfect sphere and very resistant medium point 10mm line width 04mm hexagonal barrel for comfortable handling clear barrel for visible ink supply cap and plug color matches ink color ventilated cap compliant with iso 11540 bs 7272 1 standard this product bic cristal original medium ball pens box 50 blue box of 50 ball