Brighten your writing with OHTO\’s super-smooth Fude Ball Bio Colour Rollerball Pen. Available in a wide range of colours, the Fude Ball Bio features a waterproof and fade-resistant ink that dries almost instantly, allowing you to add a dash of colour to your work without risk of smudging. Each pen can write for up to 600 metres, and will keep working even if the cap is left off for 2 days.