Lamy Safari Rollerball Colors/Body Material: Matte Black & Lilac / ABS Resin Ink Color: Black This is a Lamy Safari rollerball pen. I am selling a set with matte black and lilac colors. Rollerball pens use water-based ink, offering a smooth writing experience and allowing for writing with light pressure. I have never actually used a rollerball pen myself, so I don't know much about the product. I have included as much information as possible for this listing, so I hope to sell it to someone who understands the product.