Pentel N50 Bullet Tip Permanent Marker Robust bullet tip permanent marker for almost any surface Bonded fibre tip will retain its shape Permanent and waterproof ink will mark on metal, wood, glass, card or plastic Strong aluminium barrel. Features - The UK's favourite bullet point permanent marker - Robust aluminium barrel - Bonded fibre tip retains its shape - Will write on almost any surface, including cardboard, metal, wood, plastic and glass - 4.3mm tip gives approx a 2.2mm line width.