This is a bolt-style pen made with 3D printing technology. Compared to ordinary daily steel pens, it features a more ergonomic design and a more comfortable and convenient user experience. The pen body is shaped like a curved triangle, which ensures the minimum diameter while maximizing the comfort of grip. From the edge of the pen tip to the tip of the pen, the width of the pen body is about 10 mm; the entire pen is 145 mm long. The pen core adopts a BIC standard 1.0 mm medium retractable ballpoint pen core.