GEL INK ROLLERBALL PEN SET:Our 12 pack black pens are 0.5mm fine point, tip offers high precision for detailed drawings, sketches, and technical illustrations, helping to create sharper, more detailed drawings and lines. The highly pigment and quick - drying ink are easy to meet your writing or sketching needs LAST LONG SMOOTH INK FLOW PEN:We select water based ink to make our gel ink pens, safe and reliable, 0.5mm point makes roller ball pens easy to write, free - flowing ink provides smooth, crisp application which helps you keep work neat and organized. Writes smoothly on paper, perfect for every day uses, especially for those who writes a lot in daily life SIMPLISTIC DESIGN:The convenient clip design can firmly clip the gel pen to a book, notebook or bag, easy to carry TRANSPARENT CASE:Transparent ink pen tube has a unique design with a transparent pen case, you can clearly see the ink supply, which have good quality ink and will not leak ink, even if you use for a long time WIDE APPLICATION:Our black gel pens are perfect for using in office, class, marking different words and doing some important notes also can be used for school prizes, Christmas present, children's birthday parties