Metal rollerball pens are a practical writing instrument for any advertising campaign. Use custom rollerball pens as an effective brand promotion marketing tool. They are unique in a sense that the ink is gel based. The sleek metallic body gives them a rich look. The tips are compact and measure 0.5 or 0.7 mm in diameter with a smooth flow of ink which makes the whole writing experience enjoyable. Printed or engraved rollerball pens are a must have product for corporate advertising.