Ballpoint diameter: 0.5mm / Mechanical pencil lead diameter: 0.5mm Weight: 15.3g This slim and lightweight multi-function pen features the frequently used black and red ballpoint pens (Jetstream) plus a mechanical pencil. Specifications: Black and red ballpoint pens + mechanical pencil Size: Shaft diameter 12.2mm x thickness 17.1mm x total length 147.6mm The optimal weight balance and slim design improve the grip, allowing you to better experience the smooth writing feel of Jetstream. Ink colors: Black, Red The Jetstream multi-function pen, popular for its irresistibly smooth writing, now has a 2-color ballpoint pen + mechanical pencil lineup! Compared to the previous 4-color + mechanical pencil product, the shaft diameter has been reduced by approximately 1.5mm by focusing on the frequently used black and red colors. By making it slimmer and lighter, the optimal weight balance and grip have been improved, allowing you to better experience the smooth writing feel of the ultra-low friction Jetstream ink. This pen is easier to grip, even for those who found the previous products a bit too thick. It has a stylish design with a calm color scheme that matches various scenes such as the office, work, and private use.