Cartridge rollerball pen easy. With cap. Cartridge Type: Standard Ink Cartridge replaceable and interchangeable. Ink Type: Water-Based. Cartridge Type: wear-resistant stainless steel tip; M Royal Blue – Replaceable. Pen Design: Plastic, ergonomic rubber grip. Clip Material: Plastic. Suitable for left or right handed users. Barrel colour: dark grey with printed design. Design of contents 1 Blister Card with 2 ink cartridges.