One of the special features of Montblanc is that they always have special pen designs, with the version you are seeing, a small and slim pen, but can use up to 2 nibs.
The body of the pen is made entirely of metal, the surface is treated to look like scratched aluminum, along with the additional details covered with a shiny Platinum plating.
The pen is a Slimline trackball version currently in stock.
Details: https://butchinhhang.com/san-pham/but-montblanc-slimline-2-color-ballpoint-pen/