Gel Ink Pen: 1)Material: titanium head steel balls 2Color: black 3)Suitable for schools and offices Gel Ink Pens:1. Suitable for schools and offices2. Special rubber handshake,Feel more comfortable,Writing for a long time3. Titanium ball head, super wear-resistant4. Writing fluency, out the ink evenly, Forever not Break HERO 0.5mm black office gel ink pen