The world's most famous check washing prevention pen. This retractable rollerball helps you create perfectly smooth handwriting with uni-ball water, fade and chemicals resistant Super Ink with ISO 14145/2 certificate for use on documents.The pen also features a rubber grip for comfort. . Tip carbide ball 0.7 mm. Line width: 0.4 mm. Refill UMR-87. The price is per piece, commercial packaging is 12 pieces.