UPSIDEUP.store :: Replacement Brush Nibs, 0.5-5 mm, Extend the life of our refillable Neuland markers significantly by replacing their nibs. This is what we call environmental thinking and acting. Alt + 010 Important: Replace nibs of the same kind only. Otherwise problems with the flow of ink might occur. (Do not replace brush nibs in markers that originally have round nibs!) Alt + 010 Technical details: Line widthis: 0.5-5 mm Material: nylon